title: High Performance of Perovskite Solar Cells via Catalytic Treatment in Two-Step Process: The Case of Solvent Engineering.
abstract: Currently, the potential mechanism of the solvent-assisted crystallization for mixed cations perovskite thin film (FAxMA1-xPbI3) prepared via two-step solution-process still remains obscure. Here, we clarified the molecular-competing-reacted process of NH2CH═NH2I (FAI) and CH3NH3I (MAI) with PbI2(DMSO)xcomplex in dimethyl sulfoxide (DMSO) and diethyl ether (DE) catalytic solvent system in the sequential two-step solution-process. The microscopic dynamics was characterized via the characterizations of in situ photoluminescence spectra. In addition, we found that the thermal stability of the perovskite films suffered from the residual solvent with high boiling point, for example, DMSO. The further DE treatment could promote the volatility process of DMSO and accelerate the crystallization process of perovskite films. The highest PCE over 19% with slight hysteresis effect was eventually obtained with a reproducible FA0.88MA0.12PbI3solar cell, which displayed a constant power output within 100 s upon light soaking and stable PCE output within 30 d in the thermal stability test.
authors.affiliation: Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.|Institute of New Energy Technology, College of Information and Technology, Jinan University , Guangzhou, 510632, China.
authors.forename: Wenzhe
authors.initials: W
authors.lastname: Li
authors.affiliation: Institute of New Energy Technology, College of Information and Technology, Jinan University , Guangzhou, 510632, China.
authors.forename: Jiandong
authors.initials: J
authors.lastname: Fan
authors.affiliation: Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Jiangwei
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Guangda
authors.initials: G
authors.lastname: Niu
authors.affiliation: Institute of New Energy Technology, College of Information and Technology, Jinan University , Guangzhou, 510632, China.
authors.forename: Yaohua
authors.initials: Y
authors.lastname: Mai
authors.affiliation: Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University , Beijing 100084, China.
authors.forename: Liduo
authors.initials: L
authors.lastname: Wang
keywords: perovskite solar cells; solvent engineering; thermal stability; thin films; two-step process