Ishwar Naik; Rajashekhar Bhajantri; Sunil Rathod; Jagadish Naik
Abstract
In the present work, spin coated thin films of P3HT: NTCDA donor- acceptor blends of weight ratios 3:1, 1:1 ,1:3 are prepared in Toluene using the self-made spin coating machine. The experiment is focused to optimize the P:N weight ratio of the photoactive blend that can absorb maximum solar energy and ...
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In the present work, spin coated thin films of P3HT: NTCDA donor- acceptor blends of weight ratios 3:1, 1:1 ,1:3 are prepared in Toluene using the self-made spin coating machine. The experiment is focused to optimize the P:N weight ratio of the photoactive blend that can absorb maximum solar energy and also to enhance the absorption by doping it with gold nano particles. Absorption property of the samples are studied using JASCO UV VIS 670 spectrometer which shows that 1:3 blend has the broad spectral response and considered to be the best active blend. The optical band gaps of the samples are determined through Tauc’s plot, wherein the onset wavelength for 1:3 sample is found to be 660nm with a band gap of 1.87 eV. The optimized 1:3 blend is doped with gold nano-particle dispersion in citrate buffer. The absorbance gets increased on doping with nano particle with extremely broadened spectral response which is attributed to the Localized Surface Plasmon Resonance(LSPR). Photons are trapped by the gold particles in the polymer matrix for the efficient harvesting of the solar energy. The construction of the solar cell using this Plasmon enhanced photoactive material is the work under progress. Copyright © 2017 VBRI Press.
Akanksha Prakash; Shailesh Narain Sharma
Abstract
Indium Phosphide quantum dots (InP QDs) having various applications can be used for both LEDs and photovoltaics owing to its highly luminescent properties and energy harvesting potential respectively. In our work we have synthesized InP QDs using hot injection technique. Further post synthesis treatment ...
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Indium Phosphide quantum dots (InP QDs) having various applications can be used for both LEDs and photovoltaics owing to its highly luminescent properties and energy harvesting potential respectively. In our work we have synthesized InP QDs using hot injection technique. Further post synthesis treatment was given and InP/ZnS core shell nanocrystals were grown on InP core. Composites with P3HT conducting polymer were made in order to study the charge transfer/energy transfer phenomenon. InP and InP/ZnS QDs show an effective phenomenon of energy transfer and PL increment is observed in the case of composites. Whereas in the case of treated InP QDs a decrement in the PL was observed. Treatment results in removal of the surface defects and traps which help in effective charge transfer rather than energy transfer. Post synthesis treatment increases the monodispersity of the QDs which results in high quality QDs without any defects. With a simple post synthesis treatment,InP QDs can be used for both LEDs as well as photovoltaic applications. The future work involves the device fabrication of InP QDs and treated InP QDs for LED and solar cells respectively. Various characterization such photoluminescence, transmission electron microscopy, selected area diffraction was done in order to confirm the charge/energy transfer phenomenon. Copyright © 2016 VBRI Press.
