Han, Sumin Hyeong, Seok-Ki Lee, Seoung-Ki Shin, Naechul 2024-01-19T11:34:18Z 2024-01-19T11:34:18Z 2022-05-24 2022-07 1385-8947 https://pubs.kist.re.kr/handle/201004/114924 Understanding the correlation between surface passivation and degradation kinetics in vapor-deposited organic-inorganic hybrid perovskite thin films is crucial for developing strategies to enhance their structural integrity for long-term operational stability. Here, we demonstrate that the sequential introduction of vapor-phase phenethylammonium iodide (PEAI) and methylammonium (MAI) into methylammonium lead iodide (MAPbI(3)) thin films, which is obtained from PbI2, suppresses their degradation and enhances the ambient stability. Compared with the simultaneous PEAI introduction during the conversion of PbI2 to MAPbI(3), the MAPbI(3) films with sequential treatment exhibited higher PEAI surface coverage, which imparts superior resistance to degradation. Combined analyses of the exposure-time-dependent crystal structure evolution, photoemission profiles, and photocurrent generation characteristics of the films reveal that conformal PEAI passivation suppresses the volatile release of methylammonium (MA) species and the inclusion of O-2/H2O molecules. This study highlights the importance of developing a vapor-phase passivation strategy for innate polycrystalline perovskite thin films and their optoelectronic applications with long-term stability. English Elsevier BV Sequential surface passivation for enhanced stability of vapor-deposited methylammonium lead iodide thin films Article 10.1016/j.cej.2022.135715 1 Chemical Engineering Journal, v.439 Chemical Engineering Journal 439 N scie scopus 000790217400003 2-s2.0-85126280462 Engineering, Environmental Engineering, Chemical Engineering Article PEROVSKITE SOLAR-CELLS ORGANOMETAL TRIHALIDE PEROVSKITE GRAIN-BOUNDARIES EXCHANGE-REACTION DEGRADATION PERFORMANCE HETEROJUNCTION CH3NH3PBI3 EFFICIENCY IMPACT Perovskite Surface passivation Thin film Grain boundary Methylammonium lead iodide Phenethylammonium iodide