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Open AccessArticle

Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells

Center of Information optical technology, ITMO University, 197101 St. Petersburg, Russia
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Materials 2019, 12(24), 4221; https://doi.org/10.3390/ma12244221
Received: 19 November 2019 / Revised: 9 December 2019 / Accepted: 11 December 2019 / Published: 16 December 2019
Graphene-quantum dot nanocomposites attract significant attention for novel optoelectronic devices, such as ultrafast photodetectors and third-generation solar cells. Combining the remarkable optical properties of quantum dots (QDs) with the exceptional electrical properties of graphene derivatives opens a vast perspective for further growth in solar cell efficiency. Here, we applied (3-mercaptopropyl) trimethoxysilane functionalized reduced graphene oxide (f-rGO) to improve the QDs-based solar cell active layer. The different strategies of f-rGO embedding are explored. When f-rGO interlayers are inserted between PbS QD layers, the solar cells demonstrate a higher current density and a better fill factor. A combined study of the morphological and electrical parameters of the solar cells shows that the improved efficiency is associated with better layer homogeneity, lower trap-state densities, higher charge carrier concentrations, and the blocking of the minor charge carriers. View Full-Text
Keywords: solar cells; reduced graphene oxide; quantum dots; impedance spectroscopy solar cells; reduced graphene oxide; quantum dots; impedance spectroscopy
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Babaev, A.A.; Parfenov, P.S.; Onishchuk, D.A.; Dubavik, A.; Cherevkov, S.A.; Rybin, A.V.; Baranov, M.A.; Baranov, A.V.; Litvin, A.P.; Fedorov, A.V. Functionalized rGO Interlayers Improve the Fill Factor and Current Density in PbS QDs-Based Solar Cells. Materials 2019, 12, 4221.

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