Study on the long time aging behavior of MAPbI3: from experiment to first-principles simulation. Issue 51 (16th November 2022)

• Record Type: Journal Article
• Authors: Li, Yan; Dong, Yu-Jing; He, Hong; Chen, Xue-Lian; Jiang, Hao; Jia, Yu
• Is Part Of: RSC advances. Volume 12:Issue 51(2022)
• Page Start: 32979
• Page End: 32985
• Publication Date: 2022-11-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra05378k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Both defect passivation and preventing ion diffusion are necessary for reaching the stable perovskite film. Abstract : As the core functional layer of perovskite solar cells, the serious issues of the CH3 NH3 PbI3 film related to the long-term stability and its rapid degradation when exposed to the environment should be investigated deeply. In this study, the variation of phase construction, light absorption ability and fluorescence quenching ability during the long time aging process have been monitored. The results show that the degradation process is composed of the original serious fluorescence quenching and the lag behind phase decomposition. Then, the intrinsic physical mechanism has been obtained by the first-principles simulation of defect properties, which shows that the original serious fluorescence emission quenching is attributed to the deep level defects with low formation energies (such as VPb and IPb ); meanwhile, the lag behind phase decomposition is caused by the easy ionic diffusion; for example, the diffusion activation energy of the iodine ion is 0.286 eV. The results illustrate that both the defect passivation and prevention of the ion diffusion are necessary for achieving a stable perovskite film.