Effects of Guanidinium and Cesium Addition to CH₃NH₃PbI₃ Perovskite Photovoltaic Devices

Abstract

CH3NH3PbI3 perovskite compounds are unstable in air due to the migration of CH3NH3. The purpose of the present work is to investigate the effects of addition of guanidinium C(NH2)3 (GA) and cesium (Cs) on CH3NH3PbI3 perovskite solar cells. The addition of GA/Cs and the insertion of decaphenylpentasilane between the perovskite and hole transport layer improved the external quantum efficiency and short-circuit current density, and the conversion efficiencies were stable. First-principles calculations on the density of states and band structures showed reduction in the total energy by the GA addition.

Keywords

• solar cell
• guanidinium
• cesium
• polysilane
• first principles calculation
• photovoltaic device