title: Selective dissolution of halide perovskites as a step towards recycling solar cells.
abstract: Most research on perovskite solar cells has focused on improving power-conversion efficiency and stability. However, if one could refurbish perovskite solar cells, their stability might not be a critical issue. From the perspective of cost effectiveness, if failed, perovskite solar cells could be collected and recycled; reuse of their gold electrodes and transparent conducting glasses could reduce the price per watt of perovskite photovoltaic modules. Herein, we present a simple and effective method for removing the perovskite layer and reusing the mesoporous TiO2-coated transparent conducting glass substrate via selective dissolution. We find that the perovskite layer can be easily decomposed in polar aprotic solvents because of the reaction between polar aprotic solvents and Pb(2+) cations. After 10 cycles of recycling, a mesoporous TiO2-coated transparent conducting glass substrate-based perovskite solar cell still shows a constant power-conversion efficiency, thereby demonstrating the possibility of recycling perovskite solar cells.
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea.
authors.forename: Byeong Jo
authors.initials: BJ
authors.lastname: Kim
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Dong Hoe
authors.initials: DH
authors.lastname: Kim
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea.
authors.forename: Seung Lee
authors.initials: SL
authors.lastname: Kwon
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea.
authors.forename: So Yeon
authors.initials: SY
authors.lastname: Park
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.affiliation: Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 16419, Korea.
authors.forename: Hyun Suk
authors.initials: HS
authors.lastname: Jung