Kang, Byungsoo Han, Yu Jeung Hwang, Seok Joon Yoo, Yongseok Park, Hee Jeong Choi, In Yu, Subin Bae, Seunghwan Lee, Phillip Ko, Min Jae 2024-08-01T06:00:25Z 2024-08-01T06:00:25Z 2024-08-01 2024-07 1226-086X https://pubs.kist.re.kr/handle/201004/150341 Perovskite solar cells (PSCs) are a strong candidate for next-generation photovoltaics, but their long-term stability poses challenges for use as a future renewable energy source. In particular, ambient moisture causes detrimental effects on not only the stability but also performance of PSCs. Herein, alkylammonium salts with perfluorinated long alkyl chains are introduced to passivate the grain boundaries and form hydrophobic surfaces. The perfluorinated alkyl chain moiety introduced into the perovskite layer reduces defect density and suppresses nonradiative recombination, thereby enhancing carrier transport capability and achieving a power conversion efficiency (PCE) of 20.31 %. Given the hydrophobic effects of fluorinated compounds on PSCs, about 90 % of the initial PCE can be retained after 1,000 h of continuous operation under a relative humidity of similar to 40 % without encapsulation. The proposed additive strategy thus enables long-term operational stability of PSCs under humid conditions. English 한국공업화학회 Grain boundary passivation by alkylammonium salt for highly stable perovskite solar cells Article 10.1016/j.jiec.2024.01.051 1 Journal of Industrial and Engineering Chemistry, v.135, pp.397 - 405 Journal of Industrial and Engineering Chemistry 135 397 405 N scie scopus kci 001271463800001 2-s2.0-85184008076 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article HALIDE PEROVSKITES THIN-FILMS PERFORMANCE EFFICIENT SURFACE STABILITY MOISTURE Perovskite solar cells Perfluorinated alkyl chain Stability Grain boundary passivation Hydrophobicity