Crystallization process of perovskite modified by adding lead acetate in precursor solution for better morphology and higher device efficiency
Place of Publication
School of Engineering / Electron Science Research Institute
The power conversion efficiency of 15.20% is achieved in this study for planar perovskite solar cells fabricated in air from one-step spin-coating lead chloride (PbCl2) based precursor modified by additional adding 1% lead acetate (PbAc2), much higher than the reference one from pure PbCl2 precursor without modification. A higher quality perovskite film with increased coverage is the reason for this improvement. The perovskite nucleation rate and start time of nucleation are key parameters of perovskite crystallization kinetics. By adding 1% PbAc2 to the precursor, the density of perovskite crystal nucleuses is optimized to achieve the best film and then the highest device performance.