Abstract In the present investigation, optoelectronic modifications of the TiO2 host lattice thro... more Abstract In the present investigation, optoelectronic modifications of the TiO2 host lattice through insertion of Cr(III) (0.5–3.0 mol.%) as a dopant and thereafter its composites with MWCNTs prepared using single step in-situ sol-gel route and its photovoltaic performance of the hybrids was investigated using Ru(II) based sensitizer. The physicochemical properties (viz. structural, opto-electrical, morphological and charge transfer behavior) of the ternary Cr@TiO2/MWCNTs NCs are compared with the TiO2/MWCNTs NC through various spectroscopic (XRD, Raman, UV–Visible DRS, XPS, FT-IR, PL, TRPL and EIS measurements) and microscopic (HR-TEM with SAED) analysis. TRPL and EIS studies reveals that, average life time of the electrons in the excited state increases and interfacial charge transfer resistance decreases after the insertion of Cr(III) ion into the TiO2 host lattice. After the detailed physicochemical investigations, binder free NCs were deposited on the F:SnO2 (FTO) by doctor-blade technique using DMF and CH3CN solvents and then anchored with N719 dye. Finally, sensitized photoelectrode sandwiched with Pt-counter electrode for making the sandwich dye sensitized solar cells (DSSCs) and photovoltaic performance of the assembled devices was measured under AM 1.5 solar simulator for I-V and IPCE measurements. The Cr.0.010@Ti0.990C NCs based DSSCs shows highest photovoltaic conversion efficiency up to η = 7.69% which is 20% (η = 6.18%) higher to that of undoped TiO2/MWCNTs based DSSCs.
Journal of Nanoengineering and Nanomanufacturing, 2016
The present paper reports the time domain simulation of randomly textured tandem silicon solar ce... more The present paper reports the time domain simulation of randomly textured tandem silicon solar cells (SiO2/ITO/a-Si/c-Si/ZnO/Ag) using quadratic complex rational function approach (QCRF). To get an optimized solar cell structure, we have a varied thickness of ITO layer, a-Si layer, c-Si layer and ZnO layer. Higher efficiency is evident at 150 nm ITO layer thickness, 100 nm a-Si layer thickness, and 2500 nm c-Si layer thickness. We have further predicted the efficiency of randomly textured tandem silicon solar cells using the artificial neural network (ANN). In conclusion, this paper confirms that QCRF and ANN are apt tools for modeling of the tandem solar cell.
Journal of Solid State Electrochemistry, Mar 15, 2022
Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ ... more Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ =0.5x) were synthesized using sol-gel method at room temperature, and thereafter these NPs have been connected to CdS quantum dots followed by sensitization with N719 moieties for photovoltaic measurements. After the characterization, the powder form of Ti1-xFexO2-δ was mixed thoroughly with DMF solvent followed by CH3CN solvent using ultrasonicator, and then the binder-free paste was coated on transparent conductive oxide F:SnO2 (FTO) glass substrate using doctor blade technique to obtain uniform photoelectrode. After calcination, these different photoelectrodes were subsequently sensitized with either CdS QDs or N719 dye or both. Moreover, the photovoltaic performance of these prepared photoanodes was studied for the different compositions of Ti1-xFexO2-δ when it co-sensitized with CdS QDs and N719 dye. The solar device were designed through Ru-based N719 dye anchored onto Ti1-xFexO2-δ-CdS QDs photoanodes and counter electrode (Pt) as well as electrolyte (I-/I3-) and tested using solar simulator under standard light condition (100 mW/cm2). The overall conversion efficiency of DSSCs is 3.48% for Ti0.992Fe0.008O1.996:CdS:N719 dye; which is 1.5 times more than undoped TiO2 NPs.
Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ ... more Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ =0.5x) were synthesized using sol-gel method at room temperature, and thereafter these NPs have been connected to CdS quantum dots followed by sensitization with N719 moieties for photovoltaic measurements. After the characterization, the powder form of Ti1-xFexO2-δ was mixed thoroughly with DMF solvent followed by CH3CN solvent using ultrasonicator, and then the binder-free paste was coated on transparent conductive oxide F:SnO2 (FTO) glass substrate using doctor blade technique to obtain uniform photoelectrode. After calcination, these different photoelectrodes were subsequently sensitized with either CdS QDs or N719 dye or both. Moreover, the photovoltaic performance of these prepared photoanodes was studied for the different compositions of Ti1-xFexO2-δ when it co-sensitized with CdS QDs and N719 dye. The solar device were designed through Ru-based N719 dye anchored onto Ti1-xFexO2-δ-CdS QDs photoanodes and counter electrode (Pt) as well as electrolyte (I-/I3-) and tested using solar simulator under standard light condition (100 mW/cm2). The overall conversion efficiency of DSSCs is 3.48% for Ti0.992Fe0.008O1.996:CdS:N719 dye; which is 1.5 times more than undoped TiO2 NPs.
It is now extensively established that the ideal way to achieve the development in heterogeneous ... more It is now extensively established that the ideal way to achieve the development in heterogeneous ca-talysis is to utilize semiconducting titanium dioxide (TiO2) based particles with high surface area as well as mesoporous structure. This can efficiently accommodate substrates on its surface to interact with each other. Most of the reduction-oxidation type organic transformations, degradation of hazardous organic moieties are feasible at moderate reaction conditions with the help of TiO2 nanoparticles due to their ability to form composites with enhanced performance, better metal support interactions, chemical stability, selectivity and presence of reactive acid-base sites on its surface. This review article provides a balanced and comprehensive analysis of some innovative and ambitious strategies for modification of TiO2 host material for heterogeneous catalysis: a) making its composites with other materials; and b) doping by metal or non-metal.
AbstractA noncovalent interaction based self-assembled ruthenium (II) phthalocyanine (RuPc) and N... more AbstractA noncovalent interaction based self-assembled ruthenium (II) phthalocyanine (RuPc) and N-pyridyl-peryleneimide (PyPMI) dyad has been exploited to fabricate n-type dye-sensitized solar cells (DSSCs). This supramolecular dyad design is an alternative method to replace the most challenging synthesis of covalent-linked dyads. Metal-coordinated-based dyad complex improved the light-harvesting properties of the photoanodes as opposed to when individual dye anchored on TiO2 surface alone. DSSCs comprise of RuPc⋅PyPMI dyad convert light-to-electrical energy more efficiently (η = 2.29%) than those made of single dye under one sun irradiation (100 mW cm−2) condition. The enhanced photovoltaic performance of the dyad-based devices is due to the broader light absorption of the dyad in the longer wavelengths, enabling better electron injection into the conduction band of TiO2. The combined effect of efficient electron-hole charge separation and the long-lived charge-separated states fac...
In the present investigation, optoelectronic modifications of the TiO2 host lattice through inser... more In the present investigation, optoelectronic modifications of the TiO2 host lattice through insertion of Cr(III) (0.5–3.0 mol.%) as a dopant and thereafter its composites with MWCNTs prepared using single step in-situ sol-gel route and its photovoltaic performance of the hybrids was investigated using Ru(II) based sensitizer. The physicochemical properties (viz. structural, opto-electrical, morphological and charge transfer behavior) of the ternary Cr@TiO2/MWCNTs NCs are compared with the TiO2/MWCNTs NC through various spectroscopic (XRD, Raman, UV–Visible DRS, XPS, FT-IR, PL, TRPL and EIS measurements) and microscopic (HR-TEM with SAED) analysis. TRPL and EIS studies reveals that, average life time of the electrons in the excited state increases and interfacial charge transfer resistance decreases after the insertion of Cr(III) ion into the TiO2 host lattice. After the detailed physicochemical investigations, binder free NCs were deposited on the F:SnO2 (FTO) by doctor-blade techni...
Abstract In the present investigation, optoelectronic modifications of the TiO2 host lattice thro... more Abstract In the present investigation, optoelectronic modifications of the TiO2 host lattice through insertion of Cr(III) (0.5–3.0 mol.%) as a dopant and thereafter its composites with MWCNTs prepared using single step in-situ sol-gel route and its photovoltaic performance of the hybrids was investigated using Ru(II) based sensitizer. The physicochemical properties (viz. structural, opto-electrical, morphological and charge transfer behavior) of the ternary Cr@TiO2/MWCNTs NCs are compared with the TiO2/MWCNTs NC through various spectroscopic (XRD, Raman, UV–Visible DRS, XPS, FT-IR, PL, TRPL and EIS measurements) and microscopic (HR-TEM with SAED) analysis. TRPL and EIS studies reveals that, average life time of the electrons in the excited state increases and interfacial charge transfer resistance decreases after the insertion of Cr(III) ion into the TiO2 host lattice. After the detailed physicochemical investigations, binder free NCs were deposited on the F:SnO2 (FTO) by doctor-blade technique using DMF and CH3CN solvents and then anchored with N719 dye. Finally, sensitized photoelectrode sandwiched with Pt-counter electrode for making the sandwich dye sensitized solar cells (DSSCs) and photovoltaic performance of the assembled devices was measured under AM 1.5 solar simulator for I-V and IPCE measurements. The Cr.0.010@Ti0.990C NCs based DSSCs shows highest photovoltaic conversion efficiency up to η = 7.69% which is 20% (η = 6.18%) higher to that of undoped TiO2/MWCNTs based DSSCs.
Journal of Nanoengineering and Nanomanufacturing, 2016
The present paper reports the time domain simulation of randomly textured tandem silicon solar ce... more The present paper reports the time domain simulation of randomly textured tandem silicon solar cells (SiO2/ITO/a-Si/c-Si/ZnO/Ag) using quadratic complex rational function approach (QCRF). To get an optimized solar cell structure, we have a varied thickness of ITO layer, a-Si layer, c-Si layer and ZnO layer. Higher efficiency is evident at 150 nm ITO layer thickness, 100 nm a-Si layer thickness, and 2500 nm c-Si layer thickness. We have further predicted the efficiency of randomly textured tandem silicon solar cells using the artificial neural network (ANN). In conclusion, this paper confirms that QCRF and ANN are apt tools for modeling of the tandem solar cell.
Journal of Solid State Electrochemistry, Mar 15, 2022
Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ ... more Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ =0.5x) were synthesized using sol-gel method at room temperature, and thereafter these NPs have been connected to CdS quantum dots followed by sensitization with N719 moieties for photovoltaic measurements. After the characterization, the powder form of Ti1-xFexO2-δ was mixed thoroughly with DMF solvent followed by CH3CN solvent using ultrasonicator, and then the binder-free paste was coated on transparent conductive oxide F:SnO2 (FTO) glass substrate using doctor blade technique to obtain uniform photoelectrode. After calcination, these different photoelectrodes were subsequently sensitized with either CdS QDs or N719 dye or both. Moreover, the photovoltaic performance of these prepared photoanodes was studied for the different compositions of Ti1-xFexO2-δ when it co-sensitized with CdS QDs and N719 dye. The solar device were designed through Ru-based N719 dye anchored onto Ti1-xFexO2-δ-CdS QDs photoanodes and counter electrode (Pt) as well as electrolyte (I-/I3-) and tested using solar simulator under standard light condition (100 mW/cm2). The overall conversion efficiency of DSSCs is 3.48% for Ti0.992Fe0.008O1.996:CdS:N719 dye; which is 1.5 times more than undoped TiO2 NPs.
Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ ... more Ti1-xFexO2-δ nanoparticles (NPs) with varying content of Fe (III) ions (x = 0.008 to 0.024 and δ =0.5x) were synthesized using sol-gel method at room temperature, and thereafter these NPs have been connected to CdS quantum dots followed by sensitization with N719 moieties for photovoltaic measurements. After the characterization, the powder form of Ti1-xFexO2-δ was mixed thoroughly with DMF solvent followed by CH3CN solvent using ultrasonicator, and then the binder-free paste was coated on transparent conductive oxide F:SnO2 (FTO) glass substrate using doctor blade technique to obtain uniform photoelectrode. After calcination, these different photoelectrodes were subsequently sensitized with either CdS QDs or N719 dye or both. Moreover, the photovoltaic performance of these prepared photoanodes was studied for the different compositions of Ti1-xFexO2-δ when it co-sensitized with CdS QDs and N719 dye. The solar device were designed through Ru-based N719 dye anchored onto Ti1-xFexO2-δ-CdS QDs photoanodes and counter electrode (Pt) as well as electrolyte (I-/I3-) and tested using solar simulator under standard light condition (100 mW/cm2). The overall conversion efficiency of DSSCs is 3.48% for Ti0.992Fe0.008O1.996:CdS:N719 dye; which is 1.5 times more than undoped TiO2 NPs.
It is now extensively established that the ideal way to achieve the development in heterogeneous ... more It is now extensively established that the ideal way to achieve the development in heterogeneous ca-talysis is to utilize semiconducting titanium dioxide (TiO2) based particles with high surface area as well as mesoporous structure. This can efficiently accommodate substrates on its surface to interact with each other. Most of the reduction-oxidation type organic transformations, degradation of hazardous organic moieties are feasible at moderate reaction conditions with the help of TiO2 nanoparticles due to their ability to form composites with enhanced performance, better metal support interactions, chemical stability, selectivity and presence of reactive acid-base sites on its surface. This review article provides a balanced and comprehensive analysis of some innovative and ambitious strategies for modification of TiO2 host material for heterogeneous catalysis: a) making its composites with other materials; and b) doping by metal or non-metal.
AbstractA noncovalent interaction based self-assembled ruthenium (II) phthalocyanine (RuPc) and N... more AbstractA noncovalent interaction based self-assembled ruthenium (II) phthalocyanine (RuPc) and N-pyridyl-peryleneimide (PyPMI) dyad has been exploited to fabricate n-type dye-sensitized solar cells (DSSCs). This supramolecular dyad design is an alternative method to replace the most challenging synthesis of covalent-linked dyads. Metal-coordinated-based dyad complex improved the light-harvesting properties of the photoanodes as opposed to when individual dye anchored on TiO2 surface alone. DSSCs comprise of RuPc⋅PyPMI dyad convert light-to-electrical energy more efficiently (η = 2.29%) than those made of single dye under one sun irradiation (100 mW cm−2) condition. The enhanced photovoltaic performance of the dyad-based devices is due to the broader light absorption of the dyad in the longer wavelengths, enabling better electron injection into the conduction band of TiO2. The combined effect of efficient electron-hole charge separation and the long-lived charge-separated states fac...
In the present investigation, optoelectronic modifications of the TiO2 host lattice through inser... more In the present investigation, optoelectronic modifications of the TiO2 host lattice through insertion of Cr(III) (0.5–3.0 mol.%) as a dopant and thereafter its composites with MWCNTs prepared using single step in-situ sol-gel route and its photovoltaic performance of the hybrids was investigated using Ru(II) based sensitizer. The physicochemical properties (viz. structural, opto-electrical, morphological and charge transfer behavior) of the ternary Cr@TiO2/MWCNTs NCs are compared with the TiO2/MWCNTs NC through various spectroscopic (XRD, Raman, UV–Visible DRS, XPS, FT-IR, PL, TRPL and EIS measurements) and microscopic (HR-TEM with SAED) analysis. TRPL and EIS studies reveals that, average life time of the electrons in the excited state increases and interfacial charge transfer resistance decreases after the insertion of Cr(III) ion into the TiO2 host lattice. After the detailed physicochemical investigations, binder free NCs were deposited on the F:SnO2 (FTO) by doctor-blade techni...
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