Polymerization Strategies to Construct a 3D Polymer Passivation Network toward High Performance Perovskite Solar Cells
Release time:2024-01-19
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Key Words:LEAD IODIDE; EFFICIENT; METHYLAMMONIUM; MIGRATION; LENGTHS; FILMS
Abstract:The spontaneously formed uncoordinated Pb2+ defects usually make the perovskite films demonstrate strong n-type with relatively lower carrier diffusion length and serious non-radiative recombination energy loss. In this work, we adopt different polymerization strategies to construct three-dimensional passivation frameworks in the perovskite layer. Thanks to the strong C equivalent to N center dot center dot center dot Pb coordination bonding and the penetrating passivation structure, the defect state density is obviously reduced, accompanied by a significant increase in the carrier diffusion length. Additionally, the reduction of iodine vacancies also changed the Fermi level of the perovskite layer from strong n-type to weak n-type, which substantially promotes the energy level alignment and carrier injection efficiency. As a result, the optimized device achieved an efficiency exceeded 24 % (the certified efficiency is 24.16 %) with a high open-circuit voltage of 1.194 V, and the corresponding module achieved an efficiency of 21.55 %.
Volume:62
Issue:18
Translation or Not:no