Investigation of the Effect of Band Offset and Mobility of Organic/Inorganic HTM Layers on the Performance of Perovskite Solar Cells

Perovskite solar cells have become an attractive subject in the solar energy device area. During ten years of development, the energy conversion efficiency has been improved from 2.2% to more than 22%, and it still has a very good potential for further enhancement. In this paper, a numerical model of the perovskite solar cell with the structure of glass/ FTO/ TiO2/ H3NH3PbI3/ HTM/Au by using Silvaco Atlas software is presented. The effect of hole transport material characteristics, including hole mobility and band gap offset of organic and inorganic HTM layers such as Spiro-MOeTAD, CuO and Cu2O on the performance of PSCs are investigated. The simulation results reveal that with increase of hole mobility in hole transport layer, the cell efficiency is increases. Meanwhile, the solar cell exhibits a better performance by using inorganic materials like CuO and Cu2O as hole transport layer, than by using Spiro-MOeTAD, particularly the efficiency reaches 22.12% when Cu2O is used.