Influence of Electron Transporting Layer on the Efficiency of Tin-based Perovskite Solar Cells

Abstract

In organometallic halide perovskites solar cells, electron transporting layer has significant impact on the optical, structural and optical properties of these promising solar cells. In this work, influence of electron transporting layer on the electrical performance of tin-based perovskite solar cells were numerically investigated using Solar Capacitance (SCAPS) simulator. In order to achieve an optimal efficiency, the effect of ETL thickness and doping concentration were varied and investigated. The results show that PCE is significantly dropped with increased ETL thickness using C60 and CdS from 50 nm to 300 nm. Conversely, a steady PCE as the thickness of Cd0.5Zn0.5S and ZnO increased were observed. Furthermore, varied ETL donor concentration significantly influenced the performance of the simulated devices. Generally, moderate doping concentration is required as heavy concentration leads to increased recombination rate and subsequently reduced the PCE of the devices. Cd0.5Zn0.5S and ZnO exhibited best PCE at doping concentration value of 1019 cm-3 and 1020 cm-3 respectively. It can be concluded that Cd0.5Zn0.5S and ZnO are potential alternative ETL in perovskite solar cells.