Kim, Soyoung Jeong, Inyoung Park, Cheolwoo Kang, Gumin Han, Il Ki Kim, Wooyul Park, Minwoo 2024-01-19T18:33:15Z 2024-01-19T18:33:15Z 2022-01-11 2019-12 0927-0248 https://pubs.kist.re.kr/handle/201004/119238 Solvent engineering has been considered a reliable process for the fabrication of pinhole-free and highly crystalline perovskite thin films. Recently, green solvents have received immense attention, as the toxic antisolvents used in the conventional fabrication process cause environmental and health hazards. In this regard, ethyl acetate (EA) is a promising environmentally friendly antisolvent. Here, we present the fabrication of perovskites with controlled morphologies by changing the composition of the perovskite and the volume of EA in ambient humidity. The incorporation of [HC(NH2)(2)]PbIBr2 into a CH3NH3PbI3 matrix results in a grain size up to similar to 1.5 mu m. This induces a considerable reduction of trap density, leading to the suppression of charge recombination and, consequently, improvement in the photoluminescence characteristics. The resulting power conversion efficiencies (PCEs) of the optimized devices are 20.93% and 19.51% for active areas of 0.12 cm(2) and 0.7 cm(2), respectively. The reduced diffusion of moisture along grain boundaries improves device stability. Further, by virtue of the excellent humidity resistance of EA, the film morphologies obtained at high relative humidity (50%) are similar to those obtained under dry conditions, exhibiting an impressive PCE of 20.11%. We believe that our optimized fabrication process using EA can be extended to other green antisolvent systems. English ELSEVIER GRAIN-BOUNDARIES BASE ADDUCT CRYSTALLIZATION RECOMBINATION FORMAMIDINIUM PLANAR FILMS ABSORBER KINETICS Morphology control of perovskite in green antisolvent system for MAPbI(3)-based solar cells with over 20% efficiency Article 10.1016/j.solmat.2019.110197 1 SOLAR ENERGY MATERIALS AND SOLAR CELLS, v.203 SOLAR ENERGY MATERIALS AND SOLAR CELLS 203 scie scopus 000494054000034 2-s2.0-85072633833 Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Energy & Fuels Materials Science Physics Article GRAIN-BOUNDARIES BASE ADDUCT CRYSTALLIZATION RECOMBINATION FORMAMIDINIUM PLANAR FILMS ABSORBER KINETICS Perovskite solar cell Green antisolvent Ethyl acetate Grain size Solvent and compositional engineering