Numerical modelling: Design and investigation of uniformly and non-uniformly doped absorber layer based PN homojunction perovskite solar cell variants

Abstract

Perovskite Solar Cell (PSC) is the fastly emerging solar technology. The unexpected optoelectronic properties of perovskite material and high performance of these cells makes them an exceptional choice for solar photovoltaics. This work aims to propose and investigate four design variants of regular homojunction lead-based PSC namely uniform absorber PSC, uniform absorber optimum PSC, graded absorber PSC and graded absorber optimum PSC with structure as TCO/WS2/MAPbI3(n)/MAPbI3(p)/MoO3/Metal. The homojunction structure explored in this work identify absorber thickness, doping density, defect density, temperature, diffusion length, and lifetime of charge carriers as strong contestants in PSC design. In this paper, all the key parameters of uniform absorber PSC are evaluated, analyzed, discussed, and further fine-tuned to obtain optimum results with Power Conversion Efficiency (PCE) of 26.81%. Further, the impact of graded absorber layer on performance of PSC is investigated. Results show that grading in absorber layer will improve the performance parameters of PSC. Graded absorber optimum PSC shows efficiency of 28.26% which is higher than the uniform absorber PSC by 7.48%.