Interfacial toughening with self-assembled monolayers enhances perovskite solar cell reliability
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- 7 May 2021
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 372 (6542), 618-622
- https://doi.org/10.1126/science.abf5602
Abstract
Iodine-terminated self-assembled monolayer (I-SAM) was used in perovskite solar cells (PSCs) to achieve a 50% increase of adhesion toughness at the interface between the electron transport layer (ETL) and the halide perovskite thin film to enhance mechanical reliability. Treatment with I-SAM also increased the power conversion efficiency from 20.2% to 21.4%, reduced hysteresis, and improved operational stability with a projected T80 (time to 80% initial efficiency retained) increasing from ~700 hours to 4000 hours under 1-sun illumination and with continuous maximum power point tracking. Operational stability–tested PSC without SAMs revealed extensive irreversible morphological degradation at the ETL/perovskite interface, including voids formation and delamination, whereas PSCs with I-SAM exhibited minimal damage accumulation. This difference was attributed to a combination of a decrease in hydroxyl groups at the interface and the higher interfacial toughness.Keywords
Funding Information
- National Science Foundation (1538893)
- Office of Naval Research (N00014-17-1-2232)
- Office of Naval Research (N00014-20-1-2574)
- National Science Foundation (2002158)
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