title: Enhancing Stability of Perovskite Solar Cells to Moisture by the Facile Hydrophobic Passivation.
abstract: In this study, a novel and facile passivation process for a perovskite solar cell is reported. Poor stability in ambient atmosphere, which is the most critical demerit of a perovskite solar cell, is overcome by a simple passivation process using a hydrophobic polymer layer. Teflon, the hydrophobic polymer, is deposited on the top of a perovskite solar cell by a spin-coating method. With the hydrophobic passivation, the perovskite solar cell shows negligible degradation after a 30 day storage in ambient atmosphere. Suppressed degradation of the perovskite film is proved in various ways: X-ray diffraction, light absorption spectrum, and quartz crystal microbalance. This simple but effective passivation process suggests new kind of approach to enhance stability of perovskite solar cells to moisture.
authors.affiliation: †Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyoja-Dong, Pohang-Si 790-784, Republic of Korea.
authors.forename: Insung
authors.initials: I
authors.lastname: Hwang
authors.affiliation: §Advanced Functional Nanomaterial Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyoja-Dong, Pohang-Si 790-784, Republic of Korea.|‡Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Republic of Korea.
authors.forename: Inyoung
authors.initials: I
authors.lastname: Jeong
authors.affiliation: §Advanced Functional Nanomaterial Laboratory, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyoja-Dong, Pohang-Si 790-784, Republic of Korea.
authors.forename: Jinwoo
authors.initials: J
authors.lastname: Lee
authors.affiliation: ‡Photo-Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 136-791, Republic of Korea.|⊥KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul 136-701, Republic of Korea.
authors.forename: Min Jae
authors.initials: MJ
authors.lastname: Ko
authors.affiliation: †Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Hyoja-Dong, Pohang-Si 790-784, Republic of Korea.
authors.forename: Kijung
authors.initials: K
authors.lastname: Yong
keywords: degradation of perovskite; encapsulation; hydrophobicity; passivation; perovskite solar cell; stability