Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.091
Publication date: 18th July 2019
Recent research efforts on quantum dot solar cells (QDSCs) have shown that scientific investigations centered on the counter electrode (CE) can potentially yield very high efficiency, of more than 12% [1]. The concept of replacing the conventional electrocatalytic CE with novel photocathode architectures consisting of wide range of visible and NIR light responsive quantum dots is being scrutinized in the quest for increasing power conversion efficiencies. Quantum dots are more promising light-absorbing photovoltaic material over dyes. Engineering a p/n tandem QDSC by assembling both a photoanode (based on n-type TiO2 or ZnO) and photocathode (typically based on p-type NiO semiconductor) in a single device can potentially lead to (i) light harvesting over a broader range of the electromagnetic spectrum, (ii) open-circuit voltage increment and (iii) reduced recombination at various interfaces.
Light harvesting metal chalcogenides were deposited onto NiO nanostructure scaffold and on pairing with the n-QDSC i.e., CdS QD-sensitized TiO2 layer coated with hole conducting selenium nanowires, efficient charge separation occurs and a power conversion efficiency of more than 8% was achieved. In spite of the disparity in performance of the p- and n-QDSC half cells owing to the reverse pathways for electron propagation, the synergism between the half-cells with complementary effects, when juxtaposed, gets reflected in terms of substantial gains in the photovoltaic performance of the tandem device. This work rationalizes the charge propagation dynamics between the photoanode and photocathode elaborately to obtain a hitherto unmatched solar energy conversion in tandem QDSCs.
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