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. 2020 Sep 10;12(9):2061. doi: 10.3390/polym12092061

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) SEM images of the HTM-SLT- and HTM-SLTM-based PSCs after long-term stability testing for one month; red ovals highlight cracks (S=spiro-OMeTAD, L=Li-TFSI, T=TBP, M=POM@Cu-BTC; insets: water contact angle test). (b) Normalized PCEs over time. Reprinted from [153] with permission. Copyright© 2019, WILEY. (c) SEM surface images (insets: hydrophily) and 3D AFM profiles for SP and SP-MOF samples. (d) The typical J–V curves of PSCs with SP and SP-MOF HTLs over time, in a wet environment. Reprinted from [160] with permission. Copyright© 2019, Elsevier. (e) Stability measurements for the pristine PSCs and PSCs with NPC (insets: water contact angles). Reprinted from [161] with permission. Copyright© 2019, WILEY.