Enhancing Chemical Stability and Suppressing Ion Migration in CH3NH3PbI3 Perovskite Solar Cells via Direct Backbone Attachment of Polyesters on Grain Boundaries

Zhou, Yuchen; Yin, Yifan; Zuo, Xianghao; Wang, Likun; Li, Tai-De; Zhou, Yuanyuan; Padture, Nitin P.; Yang, Zhenhua; Guo, Yichen; Xue, Yuan; Kisslinger, Kim; Cotlet, Mircea; Nam, Chang-Yong; Rafailovich, Miriam H.

doi:10.1021/acs.chemmater.0c00995

Title: Enhancing Chemical Stability and Suppressing Ion Migration in CH₃NH₃PbI₃ Perovskite Solar Cells via Direct Backbone Attachment of Polyesters on Grain Boundaries

Journal Article · Fri May 22 00:00:00 EDT 2020 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.0c00995· OSTI ID:1642408

Zhou, Yuchen ^[1]; Yin, Yifan ^[1]; Zuo, Xianghao ^[1];

^[1]; Li, Tai-De ^[2]; Zhou, Yuanyuan ^[3];

^[3]; Yang, Zhenhua ^[1];

^[1]; Xue, Yuan ^[1]; Kisslinger, Kim ^[4]; Cotlet, Mircea ^[4];

^[5]; Rafailovich, Miriam H. ^[1]

Stony Brook Univ., NY (United States)
City Univ. of New York (CUNY), NY (United States)
Brown Univ., Providence, RI (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Stony Brook Univ., NY (United States)

Organic–inorganic halide perovskites feature excellent optoelectronic properties but poor chemical stability. While passivating perovskite grain boundary (GB) by polymers shows prospects on long-term performance of perovskite solar cells (PSCs), its detailed impact on the ion migration phenomenon, which largely deteriorates the PSC stability, remains less probed. In this work, we introduce a new polar polymer, polycaprolactone (PCL), to passivate GBs of methylammonium lead triiodide (MAPbI₃) perovskite with only 1–2 polymer monolayers via direct backbone attachment. The PSCs with passivated MAPbI₃, using a classic but less stable Spiro-OMeTAD (2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene) hole transport layer (HTL), exhibit improved power conversion efficiencies up to 20.1%, with 90% of the initial PCE being preserved after 400 h ambient storage, and 80% even after 100 h, 85 °C aging. The improved PSC stability indicates critical roles of PCL GB passivation in retarding moisture-induced decomposition and suppressing ion migration within the perovskite. Furthermore, time-of-flight secondary ion mass spectrometry reveals that I– ions can actively migrate into the electrode, HTL, and their interface in nonpassivated PSCs, even without an externally applied electric field, while such migration is significantly mitigated in PCL-passivated PSCs. This effective GB passivation by PCL suggests an important potential of polymer additives toward the development of stable high-performance PSCs.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); National Research Foundation of Korea (NRF); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; NSF-1344267; 2017K1A1A2013153; OIA-1538893; N00014-17-1-2232; OIA-1929019

OSTI ID:: 1642408

Report Number(s):: BNL-216171-2020-JAAM

Journal Information:: Chemistry of Materials, Vol. 32, Issue 12; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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36 MATERIALS SCIENCE
Passivation
thin films
ions
perovskites
polymers

Title: Enhancing Chemical Stability and Suppressing Ion Migration in CH3NH3PbI3 Perovskite Solar Cells via Direct Backbone Attachment of Polyesters on Grain Boundaries

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References (74)

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Title: Enhancing Chemical Stability and Suppressing Ion Migration in CH₃NH₃PbI₃ Perovskite Solar Cells via Direct Backbone Attachment of Polyesters on Grain Boundaries