Solar cell capacitance simulation and experimental photovoltaic performance analysis of perovskite solar cell based on CsGeI3

Abstract

In this study, the experimental results of the perovskite solar cell with FTO/TiO2/CsGeI3/spiro-OMeTAD/Pt cell architecture are compared with the simulated results obtained using SCAPS-1D. Optimizations have been carried out by changing TiO2 ETL with CdS and Cd0.5Zn0.5S and spiro-OMeTAD HTL with inorganic CuI, Cu2O, CuSCN and NiO, thickness of perovskite, ETL, HTL and the temperature to formulate a high-performance perovskite solar cell. The impact of varying absorber thickness, ETL and temperature exhibit very minimal or no change. However, the simulated device exhibits high power conversion (4.94% to 7.12%) efficiency by replacement of TiO2 with Cd0.5Zn0.5S. Further, the impact of change of inorganic HTLs have also been studied by considering Cd0.5Zn0.5S as ETL. All inorganic HTLs outperformed well with almost similar cell efficiency (∼19.9%); NiO being highest. Therefore, analyzing all the results, we suggest that to draw a high-power conversion efficiency Cd0.5Zn0.5S shall be chosen as ETL possessing 95 nm layer thickness, 10 nm thick NiO as HTL and keep the absorber thickness 795 nm. Thus, the structure of the simulated solar cell device FTO/Cd0.5Zn0.5S/CsGeI3/NiO/Pt having such cell characteristics can be considered in the manufacturing workflow for its mass-scale production.