High Open-circuit Voltage Perovskite Solar Cell Based on CH3NH3PbBr3 Light Absorber Using Hole-conductor-layer-free Structure

Abstract

In the present work, high open-circuit voltage perovskite solar cells based on the TiO₂/Al₂O₃/carbon structure have been prepared using simple screen printing method combined with drop-casting a CH₃NH₃PbBr₃ solution. The obtained device acquired 7.1 % efficiency with 1.33 V open-circuit voltage under AM 1.5G illumination by control the perovskite solution concentration, annealing temperature, annealing time and TiO₂ mesoporous layer thickness. The obtained perovskite device had almost no hysteresis under different scan rate, showing excellent steady state power output and stability.