CoS Nanoflakes on Textured Silicon Coupled with Antimony-Decorated Tungsten Oxide for Efficient Liquid Junction Solar Cells

Maity, Debanjan and Kaur, Babneet and Ghosal, Partha and Deepa, M. (2022) CoS Nanoflakes on Textured Silicon Coupled with Antimony-Decorated Tungsten Oxide for Efficient Liquid Junction Solar Cells. ACS Applied Nano Materials. pp. 1-13. ISSN 2574-0970

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A unique liquid junction solar cell (LJSC) based on p-type hole-transporting CoS nanoflakes tethered to n-type textured silicon (T-Si) with pyramidal structures as photoanodes has been fabricated. A ferrocene/ferrocenium (Fc/Fc+) redox couple electrolyte and an electrocatalytic counter electrode film (CE) of antimony nanostructures anchored to tungsten oxide (SbNSs/WO3) are used in the cell. The cell delivers a power conversion efficiency (PCE) of ∼8.4%, which is superior by ∼97% to the LJSCs without CoS and SbNSs. CoS nanoflakes function as independent photosensitizers, generate electron/hole pairs, and increase photocurrents. They also facilitate photo-generated hole transport from T-Si to Fc and suppress charge recombination, leading to an improvement in PCE by ∼82% compared to pristine T-Si. Simultaneously, the composite of SbNSs/WO3 outperforms both SbNSs and WO3 due to better electrocatalytic activity and low overpotential for Fc+ reduction at the CE/Fc+ interface. The CoS/T-Si/Fc/Fc+/SbNSs/WO3 LJSC architecture results in a stable, reproducible performance wherein exposure to extended illumination results in a moderate loss in the PCE, indicating that this strategy of using CoS and Sb can be applied to other hybrid or tandem silicon-based solar cells.

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IITH Creators:
IITH CreatorsORCiD
Deepa, M.
Item Type: Article
Additional Information: Financial support from the Ministry of Education-Scheme for Transformational and Advanced Research in Sciences (MoE-STARS, grant number: STARS/APR2019/CS/375) India, is gratefully acknowledged by M.D. and D.M.
Uncontrolled Keywords: silicon textured cobalt sulfide antimony nanostructures solar cell
Subjects: Chemistry
Divisions: Department of Chemistry
Depositing User: . LibTrainee 2021
Date Deposited: 22 Aug 2022 09:16
Last Modified: 22 Aug 2022 09:16
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