title: Accelerated Degradation Due to Weakened Adhesion from Li-TFSI Additives in Perovskite Solar Cells.
abstract: Reliable integration of organometallic halide perovskite in photovoltaic devices is critically limited by its low stability in humid environments. Furthermore, additives to increase the mobility in the hole transport material (HTM) have deliquescence and hygroscopic properties, which attract water molecules and result in accelerated degradation of the perovskite devices. In this study, a double cantilever beam (DCB) test is used to investigate the effects of additives in the HTM layer on the perovskite layer through neatly delaminating the interface between the perovskite and HTM layers. Using the DCB test, the bottom surface of the HTM layers is directly observed, and it is found that the additives are accumulated at the bottom along the thickness (i.e., through-plane direction) of the films. It is also found that the additives significantly decrease the adhesion at the interface between the perovskite and HTM layers by more than 60% through hardening the HTM films. Finally, the adhesion-based degradation mechanism of perovskite devices according to the existence of additives is proposed for humid environments.
authors.affiliation: Department of Mechanical Engineering, KAIST , Daejeon, 305-701, Republic of Korea.
authors.forename: Inhwa
authors.initials: I
authors.lastname: Lee
authors.affiliation: Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea.
authors.forename: Jae Hoon
authors.initials: JH
authors.lastname: Yun
authors.affiliation: Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea.
authors.forename: Hae Jung
authors.initials: HJ
authors.lastname: Son
authors.affiliation: Department of Mechanical Engineering, KAIST , Daejeon, 305-701, Republic of Korea.
authors.forename: Taek-Soo
authors.identifier: http://orcid.org/0000-0002-2825-7778
authors.initials: TS
authors.lastname: Kim
keywords: additive; adhesion; decomposition mechanism; moisture; perovskite solar cell