Geeta Saini; Vandna Luthra;R. P. Tandon; Vishal Sharma
Abstract
The synthesis and characterization of two novel 3-thienyl based polythiophene derivatives PT and BT have been presented. These polymers have been synthesized by convenient and ecofriendly Pd catalyzed direct arylation polymerization method. In these polymers the alkyl side chain has been replaced by ...
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The synthesis and characterization of two novel 3-thienyl based polythiophene derivatives PT and BT have been presented. These polymers have been synthesized by convenient and ecofriendly Pd catalyzed direct arylation polymerization method. In these polymers the alkyl side chain has been replaced by alkylthienyl side chain and polymer PT analogous to regioregular poly(3-hexylthiophene) (rr-P3HT) has been synthesized. These polymers have been characterized by 1 H NMR, GPC, TGA and UV vis absorption spectroscopy. The absorption maxima of these polymers are comparable to the rr-P3HT. The polymers have very good solubility in common organic solvents and therefore the solution processing of these materials has been easily done. Solar cells of these polymers have been fabricated by using PT and BT as donor materials and PC61BM as acceptor material. It was observed that both the materials showed almost same photovoltaic characteristics. Solar cell performance of these materials has been found to be low and we are working on the optimization and improvement of power conversion efficiency of these materials.
Fokotsa V. Molefe; Mohammed Khenfouch; Mokhotjwa S. Dhlamini; Bakang M. Mothudi
Abstract
As the world demand for energy continue to increase, it is vital to improve renewable energy technologies that will replace conventional fossil fuels. Carbonaceous graphene oxide (GO) is a promising nanomaterial, easy to prepare and scale up to commensurate with industrial requirements. The nanocomposite ...
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As the world demand for energy continue to increase, it is vital to improve renewable energy technologies that will replace conventional fossil fuels. Carbonaceous graphene oxide (GO) is a promising nanomaterial, easy to prepare and scale up to commensurate with industrial requirements. The nanocomposite was prepared in the form of layered structure of GO nanomaterials and poly (3-hexylthiophene) (P3HT) for photovoltaic applications. The X-ray diffraction (XRD) revealed the interaction of P3HT with GO through decrease in lattice spacing. It was evident from scanning electron microscopy (SEM) that the presence of P3HT in GO modified flower like structure to the flaky structures. The interaction of GO with P3HT is presented by various vibrational frequencies in Fourier Transform infrared spectroscopy (FTIR). The increased absorbance and broadening of absorption was observed in the UV-vis spectrum for nanocomposite due to ionic interaction between P3HT and GO. The tunable photoluminescence (PL) measurements showed quenching and shifting of emission spectrum due to charge and energy-transfer. The nanocomposite establish the formation and existence of energy levels upon interaction of GO with P3HT which enhances charge transport. This work provides the direction on coating of thin films for photovoltaic device fabrication. Copyright © 2017 VBRI Press.
Vishal Sharma; Vinamrita Singh; Manoj Arora; Swati Arora; R.P. Tandon
Abstract
Bulk-heterojunction (BHJ) organic solar cells (OSCs) were fabricated with various active layer materials. Solar cells of configuration ITO/PEDOT:PSS/P3HT:PC61BM/Al, ITO/PEDOT:PSS/P3HT:PC71BM/Al and ITO/PEDOT:PSS/ PCDTBT:PC71BM/Al were fabricated. Current density-voltage (J-V) characteristics were measured ...
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Bulk-heterojunction (BHJ) organic solar cells (OSCs) were fabricated with various active layer materials. Solar cells of configuration ITO/PEDOT:PSS/P3HT:PC61BM/Al, ITO/PEDOT:PSS/P3HT:PC71BM/Al and ITO/PEDOT:PSS/ PCDTBT:PC71BM/Al were fabricated. Current density-voltage (J-V) characteristics were measured in the dark and under illumination in ambient conditions. A single theoretical model was able to explain the J-V characteristics of all freshly prepared cells using realistic parameters.
