Alioune Sow^1,, Saliou Seck¹, Mamadou Salif Mane¹, Amadou Ndiaye¹, Bachirou Ndiaye¹, El-Hadji Mamadou Keita¹, Babacar Mbow¹, Cheikh Sene¹

All-inorganic perovskites based on CsPbI_3-xBr_x 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 CsPbI_3-xBr_x 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 CsPbI_3-xBr_x 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/CsPbI_3-xBr_x/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 (N_A=10¹⁸cm^-3) and donor (N_D=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%.

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