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Effects of Transport Window Layers on All-inorganic CsPbI3-xBrx Perovskites Based Solar Cells

Alioune Sow1,, Saliou Seck1, Mamadou Salif Mane1, Amadou Ndiaye1, Bachirou Ndiaye1, El-Hadji Mamadou Keita1, Babacar Mbow1, Cheikh Sene1

1Physics Department, Faculty of Sciences and Technology, Laboratory of Semiconductors and Solar Energy, University Cheikh Anta Diop, Dakar Country

American Journal of Energy Research. 2023, 11(2), 93-99. DOI: 10.12691/ajer-11-2-4
Received March 22, 2023; Revised April 25, 2023; Accepted May 14, 2023

Abstract

All-inorganic perovskites based on CsPbI3-xBrx are promising halides for use in efficient photovoltaic devices due to their high stability. This generated a tremendous research interest from the scientific community to move towards this class of materials. However, perovskite solar cells based on CsPbI3-xBrx have not yet achieved the expected conversion efficiencies compared to their hybrid counterpart. In this work we used SCAPS 1D to model the all-inorganic CsPbI3-xBrx based solar cell, investigate and discuss the limitations of the device in order to improve its conversion efficiency. For this purpose, we used the normal (n-i-p) configuration with Al/ETL/CsPbI3-xBrx/HTL/ITO structuring. By varying the inorganic transport layers HTL and ETL, our study revealed that the best HTL/ETL combination is Cu2O as HTL and SnO2 as ETL. We otherwise have shown that acceptor and donor doping of Cu2O and SnO2 respectively offers a mean to reduce recombination in the device. The study showed that the acceptor (NA=1018cm-3) and donor (ND=1017cm-3) doping rates are the best dopant values for the cell. By optimizing the various study parameters, we obtained a high-performance normal structure PSC with a conversion efficiency (PCE) of 17.87%.

Keywords:

Perovskite, absorber, hole transport layer, electron transport layer, solar cell
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