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Khalil Jasim

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Universitat de València

Kansas State University

Universidad del Norte - Barranquilla, Colombia

Universitas Langlangbuana

Kadir Has University

Noor Azwan Shairi

Universiti Teknikal Malaysia Melaka

Tayfun Nesimoglu

Middle East Technical University

Kalasalingam University

Richard Gauthier

Santa Rosa Junior College

Syukri Muhammad Nur

Darma Persada University

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Papers by Khalil Jasim

Curcumin Dye-Sensitized Solar Cell

Journal of energy and power engineering, Jun 28, 2017

DSSCs (dye sensitized solar cells) are expected to be one of the efficient third generation solar... more DSSCs (dye sensitized solar cells) are expected to be one of the efficient third generation solar cells that are generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. In this paper, review of the structure, and operation principles of the dye sensitized solar cell DSSC is outlined. Extraction and optical characterization of Curcumin dye are detailed. Preparation procedures, optical and electrical characterization of the DSSC using Curcumin dye, as well as factors limiting the operation of the DSSC are discussed. Open circuit voltage V oc = 430 mV and short circuit current I sc = 0.72 mA from a 3 cm 2 curcumin sensitized solar cell is achievable under solar illumination.

Henna (<i>Lawsonia inermis</i>L.) Dye-Sensitized Nanocrystalline Titania Solar Cell

Journal of Nanotechnology, 2012

Low-cost solar cells have been the subject of intensive research activities for over half century... more Low-cost solar cells have been the subject of intensive research activities for over half century ago. More recently, dye-sensitized solar cells (DSSCs) emerged as a new class of low-cost solar cells that can be easily prepared. Natural-dye-sensitized solar cells (NDSSCs) are shown to be excellent examples of mimicking photosynthesis. The NDSSC acts as a green energy generator in which dyes molecules adsorbed to nanocrystalline layer of wide bandgap semiconductor material harvest photons. In this paper we investigate the structural, optical, electrical, and photovoltaic characterization of two types of natural dyes, namely, the Bahraini Henna and the Yemeni Henna, extracted using the Soxhlet extractor. Solar cells from both materials were prepared and characterized. It was found that the levels of open-circuit voltage and short-circuit current are concentration dependent. Further suggestions to improve the efficiency of NDSSC are discussed.

Dye Enhanced Quantum Dot Sensitized Solar Cell

Advanced Materials Letters, Apr 1, 2022

Role of (Cu, Al) codoping in tuning the optical, structural and magnetic properties of Co-doped SnO2 nanostructures: A comparative study

Physica B-condensed Matter, Aug 1, 2021

Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a... more Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a co-precipitation technique to compare the effect of non-ferromagnetic codoping of Al and Cu ions on the structural-optical-magnetic properties of the Co-doped SnO2samples. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The samples were studied and characterised by several methods; X‐Ray Diffraction, UV–visible absorption spectroscopy, and magnetization measurement methods were executed. The optical bandgap of the SnO2 nanopowders (3.7 eV) was studied by diffuse reflectance spectroscopy (DRS) and found it was redshifted by doping. It was found that the hydrogenation process of the host samples should be used as supplementary necessary action that should be processed to create ferromagnetic properties in SnO2:Co:Cu sample. The optical measurements were used to measure the optical properties including the surface plasmon resonance (SPR) signal that generated by the accumulated liberated metallic nanograins (clusters) in form of intermetallic Sn0.5Co1.5 by the hydrogenation process and thus connect the SPR with the XRD results.

Nanocrystalline TiO<SUB align=right>2 based natural dye sensitized solar cells

International Journal of Nanomanufacturing, 2009

Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap ox... more Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap oxides semiconductor materials was accomplished using nanocrystalline TiO2 with henna (Lawsonia inermis L.) and raspberries (Rubus spp.) photosensitisers as a local natural organic dyes. It was shown that the nanocrystalline material based solar cell system exhibits an excellent optical absorption parameters for visible and near infrared portion of the EM spectrum. Henna and raspberries natural dyes were extracted from the corresponding dried plant using Soxhlet extractor. The open-circuit voltage and short-circuit current were measured for both of the nanocrystalline solar cell samples. Typical open circuit voltage of 400 mV and short-circuit current density of 0.47 mA/cm² were measured for raspberries cell samples for an active area of ∼3 cm² at 1.5 AM solar illumination. Henna cells samples prepared by the same technique produced an open-circuit voltage and short-circuit current density of much lesser values (200 mV, 0.04 mA/cm²). The performance of both nanocrystalline solar cell samples can be appreciably enhanced by optimising the preparation technique and using different types of electrolyte solutions.

Natural dye-sensitised photovoltaic cell based on nanoporous TiO<SUB align=right>2

International Journal of Nanoparticles, 2011

We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy... more We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy at low production cost using safe materials attached to nanoporous layer of TiO 2. In this paper, we review the operation principles of the dye-sensitised solar cell DSSC and discuss the preparation and characterisation of Henna dyes (Lawsonia inermis L.) at different concentrations. The open circuit voltage and short circuit current were measured for cells made from different Henna extracts concentrations. We found that the open circuit voltage is almost independent of dye concentration and has a typical value of 400 mV, whereas the short circuit current varies with Henna extracts concentration. The best value of the short circuit current of 0.900 mA was obtained for moderate concentration of Henna extracts.

Dye Enhanced Quantum Dot Sensitized Solar Cell

Advanced Materials Letters

Role of (Cu, Al) codoping in tuning the optical, structural and magnetic properties of Co-doped SnO2 nanostructures: A comparative study

Physica B: Condensed Matter, 2021

Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a... more Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a co-precipitation technique to compare the effect of non-ferromagnetic codoping of Al and Cu ions on the structural-optical-magnetic properties of the Co-doped SnO2samples. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The samples were studied and characterised by several methods; X‐Ray Diffraction, UV–visible absorption spectroscopy, and magnetization measurement methods were executed. The optical bandgap of the SnO2 nanopowders (3.7 eV) was studied by diffuse reflectance spectroscopy (DRS) and found it was redshifted by doping. It was found that the hydrogenation process of the host samples should be used as supplementary necessary action that should be processed to create ferromagnetic properties in SnO2:Co:Cu sample. The optical measurements were used to measure the optical properties including the surface plasmon resonance (SPR) signal that generated by the accumulated liberated metallic nanograins (clusters) in form of intermetallic Sn0.5Co1.5 by the hydrogenation process and thus connect the SPR with the XRD results.

Third-Order Nonlinear Optical Properties of Quantum Dots

Standards, Methods and Solutions of Metrology, 2019

Quantum dots (QDs) are semiconducting nanocrystalline particles. QDs are attractive photonic medi... more Quantum dots (QDs) are semiconducting nanocrystalline particles. QDs are attractive photonic media. In this chapter, we introduce third-order nonlinear optical properties and a brief idea about the physics of QDs. Z-scan technique and theoretical analysis adopted to obtain nonlinear parameters will be discussed. Analysis of third-order nonlinear optical parameters for PbS QDs suspended in toluene with radii 2.4 and 5.0 nm under different excitation beam power level and three different wavelengths (488, 514, and 633 nm) will be detailed. Third-order optical susceptibility χ (3) and optical-limiting behavior of PbS QD suspended in toluene are presented. Irrespective of their size, QDs are a good example of optical limiters with low threshold.

Determining the optical properties of blood using He-Ne laser and double integrating sphere set-up

Polish Journal of Medical Physics and Engineering, 2019

The behaviour of light interaction with biological tissue is determined by micro-optical paramete... more The behaviour of light interaction with biological tissue is determined by micro-optical parameters: refractive index (n), absorption coefficient (µa ), scattering coefficient (µs ), and anisotropy (g). The goal of this study is to measure the optical properties of normal whole blood using He-Ne laser (wavelength 632.8 nm). The refractive index is measured using the traveller microscope. The integrating sphere method is used to measure the macro-optical parameters: total diffusive reflectance, transmittance, and collimated transmittance at wavelength 632.8 nm. The macro-optical parameters are fed to Inverse Adding Doubling (IAD) theoretical technique, to estimate the micro-optical parameters (µs , µa , g). An alternative practical method is used to measure the g value based on utilising the goniometric table. The study reveals that the refractive index (n) equals 1.395±0.0547, absorption coefficient (µa ) equals 2.37 mm−1, scattering coefficient (µs ) equals 55.69 mm−1, and anisotro...

A passively mode-locked surface emitting diode laser

Conference on Lasers and Electro Optics 2003 Cleo 03, 2003

We demonstrate stable multiGHz rate picosecond pulse generation by passive mode-locking of an ext... more

Ultrashort pulse generation from vertical cavity surface emitting semiconductor lasers

Quantum Dots Solar Cells

Solar Cells - New Approaches and Reviews, 2015

A picosecond passively mode-locked vertical extended cavity surface emitting diode laser

2003 International Symposium on Compound Semiconductors

Natural Dye-sensitized Solar Cell Based on Nanocrystalline TiO2

Sains Malaysiana

During the last quarter of the twentieth century there have been intensive research activities lo... more During the last quarter of the twentieth century there have been intensive research activities looking for green sources of energy. The main aim of the green generators or converters of energy is to replace the conventional (fossil) energy sources and hence reducing further accumulation of the green house gasses GHGs. Conventional silicon and III-V semiconductor solar cell based on crystalline bulk, quantum well, and quantum dots structure or amorphous and thin film structures provided a feasible solution. However, natural dye sensitized solar cells NDSSC are a promising class of photovoltaic cells with the capability of generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. Also, natural dyes are abundant, easily extracted, and safe materials. In NDSSC, once dye molecules exposed to light they become oxidized and transfer electrons to a nanostructured layer of wide bandgap semiconductors such as TiO2. The gen...

Passively mode-locked, picosecond pulse vertical cavity surface emitting diode laser at 15 GHz repetition rates

We report a passively mode-locked vertical-cavity surface emitting laser diode (980 nm) at up to ... more

Synthesis and characterisation of curcumin–M (M=B, Fe and Cu) films grown on p-Si substrate for dielectric applications

Microelectronics Reliability, 2015

ABSTRACT Metal-coordinated yellow curcumin was extracted from green natural sources and sublimate... more ABSTRACT Metal-coordinated yellow curcumin was extracted from green natural sources and sublimated in vacuum to prepare thin films on p-Si and glass substrates for dielectric and optical investigations. The synthesised curcumin complexed with the metals boron, iron, and copper powders were crystalline while the prepared films were amorphous. The optical absorption spectrum of the prepared films showed similar two absorption band structure in the visible range. The onset energy of the main optical absorption band of the film was determined using the Tauc technique. The dielectric properties of this material were systematically studied for future applications in metal–insulator–semiconductor MIS field of applications. The complex dielectric properties were studied in the frequency range of 1–1000 kHz and was analysed. The important find is a large optoelectronic sensitivity so that the integral optical responsivity (S∗) reaches ∼1.0 A/W and the electrical conductivity increases under light illumination by ∼400–1000%. Generally, Curcumin metal complex can be used in small-k environmentally friendly production of microelectronic and optoelectronic devices.

Dye Sensitized Solar Cells - Working Principles, Challenges and Opportunities

Solar Cells - Dye-Sensitized Devices, 2011

Nanocrystalline TiO2 based natural dye sensitized solar cells

International Journal of Nanomanufacturing, 2009

Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap ox... more

Natural dye-sensitised photovoltaic cell based on nanoporous TiO<SUB align=right>2

International Journal of Nanoparticles, 2011

We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy... more We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy at low production cost using safe materials attached to nanoporous layer of TiO 2. In this paper, we review the operation principles of the dye-sensitised solar cell DSSC and discuss the preparation and characterisation of Henna dyes (Lawsonia inermis L.) at different concentrations. The open circuit voltage and short circuit current were measured for cells made from different Henna extracts concentrations. We found that the open circuit voltage is almost independent of dye concentration and has a typical value of 400 mV, whereas the short circuit current varies with Henna extracts concentration. The best value of the short circuit current of 0.900 mA was obtained for moderate concentration of Henna extracts.

Curcumin Dye-Sensitized Solar Cell

Journal of energy and power engineering, Jun 28, 2017

DSSCs (dye sensitized solar cells) are expected to be one of the efficient third generation solar... more DSSCs (dye sensitized solar cells) are expected to be one of the efficient third generation solar cells that are generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. In this paper, review of the structure, and operation principles of the dye sensitized solar cell DSSC is outlined. Extraction and optical characterization of Curcumin dye are detailed. Preparation procedures, optical and electrical characterization of the DSSC using Curcumin dye, as well as factors limiting the operation of the DSSC are discussed. Open circuit voltage V oc = 430 mV and short circuit current I sc = 0.72 mA from a 3 cm 2 curcumin sensitized solar cell is achievable under solar illumination.

Henna (<i>Lawsonia inermis</i>L.) Dye-Sensitized Nanocrystalline Titania Solar Cell

Journal of Nanotechnology, 2012

Low-cost solar cells have been the subject of intensive research activities for over half century... more Low-cost solar cells have been the subject of intensive research activities for over half century ago. More recently, dye-sensitized solar cells (DSSCs) emerged as a new class of low-cost solar cells that can be easily prepared. Natural-dye-sensitized solar cells (NDSSCs) are shown to be excellent examples of mimicking photosynthesis. The NDSSC acts as a green energy generator in which dyes molecules adsorbed to nanocrystalline layer of wide bandgap semiconductor material harvest photons. In this paper we investigate the structural, optical, electrical, and photovoltaic characterization of two types of natural dyes, namely, the Bahraini Henna and the Yemeni Henna, extracted using the Soxhlet extractor. Solar cells from both materials were prepared and characterized. It was found that the levels of open-circuit voltage and short-circuit current are concentration dependent. Further suggestions to improve the efficiency of NDSSC are discussed.

Dye Enhanced Quantum Dot Sensitized Solar Cell

Advanced Materials Letters, Apr 1, 2022

Role of (Cu, Al) codoping in tuning the optical, structural and magnetic properties of Co-doped SnO2 nanostructures: A comparative study

Physica B-condensed Matter, Aug 1, 2021

Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a... more Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a co-precipitation technique to compare the effect of non-ferromagnetic codoping of Al and Cu ions on the structural-optical-magnetic properties of the Co-doped SnO2samples. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The samples were studied and characterised by several methods; X‐Ray Diffraction, UV–visible absorption spectroscopy, and magnetization measurement methods were executed. The optical bandgap of the SnO2 nanopowders (3.7 eV) was studied by diffuse reflectance spectroscopy (DRS) and found it was redshifted by doping. It was found that the hydrogenation process of the host samples should be used as supplementary necessary action that should be processed to create ferromagnetic properties in SnO2:Co:Cu sample. The optical measurements were used to measure the optical properties including the surface plasmon resonance (SPR) signal that generated by the accumulated liberated metallic nanograins (clusters) in form of intermetallic Sn0.5Co1.5 by the hydrogenation process and thus connect the SPR with the XRD results.

Nanocrystalline TiO<SUB align=right>2 based natural dye sensitized solar cells

International Journal of Nanomanufacturing, 2009

Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap ox... more Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap oxides semiconductor materials was accomplished using nanocrystalline TiO2 with henna (Lawsonia inermis L.) and raspberries (Rubus spp.) photosensitisers as a local natural organic dyes. It was shown that the nanocrystalline material based solar cell system exhibits an excellent optical absorption parameters for visible and near infrared portion of the EM spectrum. Henna and raspberries natural dyes were extracted from the corresponding dried plant using Soxhlet extractor. The open-circuit voltage and short-circuit current were measured for both of the nanocrystalline solar cell samples. Typical open circuit voltage of 400 mV and short-circuit current density of 0.47 mA/cm² were measured for raspberries cell samples for an active area of ∼3 cm² at 1.5 AM solar illumination. Henna cells samples prepared by the same technique produced an open-circuit voltage and short-circuit current density of much lesser values (200 mV, 0.04 mA/cm²). The performance of both nanocrystalline solar cell samples can be appreciably enhanced by optimising the preparation technique and using different types of electrolyte solutions.

Natural dye-sensitised photovoltaic cell based on nanoporous TiO<SUB align=right>2

International Journal of Nanoparticles, 2011

We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy... more We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy at low production cost using safe materials attached to nanoporous layer of TiO 2. In this paper, we review the operation principles of the dye-sensitised solar cell DSSC and discuss the preparation and characterisation of Henna dyes (Lawsonia inermis L.) at different concentrations. The open circuit voltage and short circuit current were measured for cells made from different Henna extracts concentrations. We found that the open circuit voltage is almost independent of dye concentration and has a typical value of 400 mV, whereas the short circuit current varies with Henna extracts concentration. The best value of the short circuit current of 0.900 mA was obtained for moderate concentration of Henna extracts.

Dye Enhanced Quantum Dot Sensitized Solar Cell

Advanced Materials Letters

Role of (Cu, Al) codoping in tuning the optical, structural and magnetic properties of Co-doped SnO2 nanostructures: A comparative study

Physica B: Condensed Matter, 2021

Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a... more Abstract Tin oxide (SnO2) co-doped with Co/Cu and Co/Al nanoparticles were synthesised by using a co-precipitation technique to compare the effect of non-ferromagnetic codoping of Al and Cu ions on the structural-optical-magnetic properties of the Co-doped SnO2samples. The energy dispersive x-ray analysis measurements were performed to check the possible presence of any impurity elements in the nanocrystals. The samples were studied and characterised by several methods; X‐Ray Diffraction, UV–visible absorption spectroscopy, and magnetization measurement methods were executed. The optical bandgap of the SnO2 nanopowders (3.7 eV) was studied by diffuse reflectance spectroscopy (DRS) and found it was redshifted by doping. It was found that the hydrogenation process of the host samples should be used as supplementary necessary action that should be processed to create ferromagnetic properties in SnO2:Co:Cu sample. The optical measurements were used to measure the optical properties including the surface plasmon resonance (SPR) signal that generated by the accumulated liberated metallic nanograins (clusters) in form of intermetallic Sn0.5Co1.5 by the hydrogenation process and thus connect the SPR with the XRD results.

Third-Order Nonlinear Optical Properties of Quantum Dots

Standards, Methods and Solutions of Metrology, 2019

Quantum dots (QDs) are semiconducting nanocrystalline particles. QDs are attractive photonic medi... more Quantum dots (QDs) are semiconducting nanocrystalline particles. QDs are attractive photonic media. In this chapter, we introduce third-order nonlinear optical properties and a brief idea about the physics of QDs. Z-scan technique and theoretical analysis adopted to obtain nonlinear parameters will be discussed. Analysis of third-order nonlinear optical parameters for PbS QDs suspended in toluene with radii 2.4 and 5.0 nm under different excitation beam power level and three different wavelengths (488, 514, and 633 nm) will be detailed. Third-order optical susceptibility χ (3) and optical-limiting behavior of PbS QD suspended in toluene are presented. Irrespective of their size, QDs are a good example of optical limiters with low threshold.

Determining the optical properties of blood using He-Ne laser and double integrating sphere set-up

Polish Journal of Medical Physics and Engineering, 2019

The behaviour of light interaction with biological tissue is determined by micro-optical paramete... more The behaviour of light interaction with biological tissue is determined by micro-optical parameters: refractive index (n), absorption coefficient (µa ), scattering coefficient (µs ), and anisotropy (g). The goal of this study is to measure the optical properties of normal whole blood using He-Ne laser (wavelength 632.8 nm). The refractive index is measured using the traveller microscope. The integrating sphere method is used to measure the macro-optical parameters: total diffusive reflectance, transmittance, and collimated transmittance at wavelength 632.8 nm. The macro-optical parameters are fed to Inverse Adding Doubling (IAD) theoretical technique, to estimate the micro-optical parameters (µs , µa , g). An alternative practical method is used to measure the g value based on utilising the goniometric table. The study reveals that the refractive index (n) equals 1.395±0.0547, absorption coefficient (µa ) equals 2.37 mm−1, scattering coefficient (µs ) equals 55.69 mm−1, and anisotro...

A passively mode-locked surface emitting diode laser

Conference on Lasers and Electro Optics 2003 Cleo 03, 2003

We demonstrate stable multiGHz rate picosecond pulse generation by passive mode-locking of an ext... more

Ultrashort pulse generation from vertical cavity surface emitting semiconductor lasers

Quantum Dots Solar Cells

Solar Cells - New Approaches and Reviews, 2015

A picosecond passively mode-locked vertical extended cavity surface emitting diode laser

2003 International Symposium on Compound Semiconductors

Natural Dye-sensitized Solar Cell Based on Nanocrystalline TiO2

Sains Malaysiana

During the last quarter of the twentieth century there have been intensive research activities lo... more During the last quarter of the twentieth century there have been intensive research activities looking for green sources of energy. The main aim of the green generators or converters of energy is to replace the conventional (fossil) energy sources and hence reducing further accumulation of the green house gasses GHGs. Conventional silicon and III-V semiconductor solar cell based on crystalline bulk, quantum well, and quantum dots structure or amorphous and thin film structures provided a feasible solution. However, natural dye sensitized solar cells NDSSC are a promising class of photovoltaic cells with the capability of generating green energy at low production cost since no vacuum systems or expensive equipment are required in their fabrication. Also, natural dyes are abundant, easily extracted, and safe materials. In NDSSC, once dye molecules exposed to light they become oxidized and transfer electrons to a nanostructured layer of wide bandgap semiconductors such as TiO2. The gen...

Passively mode-locked, picosecond pulse vertical cavity surface emitting diode laser at 15 GHz repetition rates

We report a passively mode-locked vertical-cavity surface emitting laser diode (980 nm) at up to ... more

Synthesis and characterisation of curcumin–M (M=B, Fe and Cu) films grown on p-Si substrate for dielectric applications

Microelectronics Reliability, 2015

ABSTRACT Metal-coordinated yellow curcumin was extracted from green natural sources and sublimate... more ABSTRACT Metal-coordinated yellow curcumin was extracted from green natural sources and sublimated in vacuum to prepare thin films on p-Si and glass substrates for dielectric and optical investigations. The synthesised curcumin complexed with the metals boron, iron, and copper powders were crystalline while the prepared films were amorphous. The optical absorption spectrum of the prepared films showed similar two absorption band structure in the visible range. The onset energy of the main optical absorption band of the film was determined using the Tauc technique. The dielectric properties of this material were systematically studied for future applications in metal–insulator–semiconductor MIS field of applications. The complex dielectric properties were studied in the frequency range of 1–1000 kHz and was analysed. The important find is a large optoelectronic sensitivity so that the integral optical responsivity (S∗) reaches ∼1.0 A/W and the electrical conductivity increases under light illumination by ∼400–1000%. Generally, Curcumin metal complex can be used in small-k environmentally friendly production of microelectronic and optoelectronic devices.

Dye Sensitized Solar Cells - Working Principles, Challenges and Opportunities

Solar Cells - Dye-Sensitized Devices, 2011

Nanocrystalline TiO2 based natural dye sensitized solar cells

International Journal of Nanomanufacturing, 2009

Dye sensitised solar cells using natural organic dyes were prepared. Sensitisation of wide gap ox... more

Natural dye-sensitised photovoltaic cell based on nanoporous TiO<SUB align=right>2

International Journal of Nanoparticles, 2011

We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy... more We suggest that natural dye-sensitised solar cells (NDSSC) are capable of generating green energy at low production cost using safe materials attached to nanoporous layer of TiO 2. In this paper, we review the operation principles of the dye-sensitised solar cell DSSC and discuss the preparation and characterisation of Henna dyes (Lawsonia inermis L.) at different concentrations. The open circuit voltage and short circuit current were measured for cells made from different Henna extracts concentrations. We found that the open circuit voltage is almost independent of dye concentration and has a typical value of 400 mV, whereas the short circuit current varies with Henna extracts concentration. The best value of the short circuit current of 0.900 mA was obtained for moderate concentration of Henna extracts.