Role of defect density on the electronic transport and current-voltage characteristics of the hole transporter free perovskite solar cell

Abstract A titanium dioxide/perovskite heterojunction solar cell has been assemble and tested under the forward and reverse bias voltage to investigate the role of ionic movement and its effect on the electrical parameters. A greater extent of leakage current is obtained in the TiO2/perovskite. It results into a hysteresis curve in the current-voltage characteristics, which has a detrimental consequence on the power conversion efficiency (PCE) of the solar cell. A higher leakage current is attributed to the defect states generated due to the ionic movement. SCAPS-1D drift-diffusion model-based simulation software is used to understand the correlation between the electrical performance of the solar cell and the density of electronic defect states. A low short circuit current of assembled solar cell has been attributed to a high defect density of 1 × 1019/cm3 as explored through SCAPS 1D simulation.