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01-07-2018 | Research Paper

Enhanced efficiency of PbS quantum dot-sensitized solar cells using plasmonic photoanode

Authors: Swati Bhardwaj, Arnab Pal, Kuntal Chatterjee, Tushar H Rana, Gourav Bhattacharya, Susanta Sinha Roy, Papia Chowdhury, Ganesh D. Sharma, Subhayan Biswas

Published in: Journal of Nanoparticle Research | Issue 7/2018

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Abstract

In this report, an effort has been made to develop an efficient PbS quantum dot-sensitized photoanode by simple successive ionic layer adsorption and reduction technique to enhance the overall photovoltaic performance of PbS quantum dot-sensitized solar cells. Three strategies have been adopted for the improvement of the photovoltaic performance of PbS quantum dot-sensitized solar cells, i.e., (i) by incorporation of TiO₂-Au nanocomposites, where Au nanoparticles of different sizes are embedded into a TiO₂ matrix, and (ii) variation of temperature at which quantum dots are deposited (iii) by postdeposition annealing of QD-sensitized photoanode in Ar atmosphere. We have used electrophoretic deposition technique to develop the nanocomposite-doped photoanode. High-resolution transmission electron microscopy confirms that the Au particles dispersed in the TiO₂ matrix vary from 2 to 50 nm and PbS quantum dot size ranges 3.5–6 nm. The optical absorption of PbS quantum dot-sensitized TiO₂-Au-incorporated photoanode is substantially enhanced as confirmed from the UV-visible absorption spectra measurements. The current-voltage characteristics of all the plasmonic quantum dot-sensitized solar cells under illumination (100 mW/cm², AM 1.5) show significant improvement in power conversion efficiency using the abovementioned strategies. The maximum power conversion efficiency observed in PbS quantum dot-based quantum dot-sensitized solar cells is 7.0%. Electroimpedance spectroscopy has been utilized to understand the recombination kinetics in these solar cells.

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Title: Enhanced efficiency of PbS quantum dot-sensitized solar cells using plasmonic photoanode
Authors: Swati Bhardwaj
Arnab Pal
Kuntal Chatterjee
Tushar H Rana
Gourav Bhattacharya
Susanta Sinha Roy
Papia Chowdhury
Ganesh D. Sharma
Subhayan Biswas
Publication date: 01-07-2018
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 7/2018
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-018-4301-8

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