Stable perovskite solar cells with efficiency exceeding 24.8% and 0.3-V voltage loss
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- 25 September 2020
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 369 (6511), 1615-1620
- https://doi.org/10.1126/science.abb7167
Abstract
Further improvement and stabilization of perovskite solar cell (PSC) performance are essential to achieve the commercial viability of next-generation photovoltaics. Considering the benefits of fluorination to conjugated materials for energy levels, hydrophobicity, and noncovalent interactions, two fluorinated isomeric analogs of the well-known hole-transporting material (HTM) Spiro-OMeTAD are developed and used as HTMs in PSCs. The structure–property relationship induced by constitutional isomerism is investigated through experimental, atomistic, and theoretical analyses, and the fabricated PSCs feature high efficiency up to 24.82% (certified at 24.64% with 0.3-volt voltage loss), along with long-term stability in wet conditions without encapsulation (87% efficiency retention after 500 hours). We also achieve an efficiency of 22.31% in the large-area cell.Keywords
Funding Information
- Ulsan National Institute of Science and Technology (1.200042)
- Ministry of Science, ICT and Future Planning (2012M3A6A5055225)
- Ministry of Science, ICT and Future Planning (2020M1A2A2080746)
- Korea Institute of Energy Research (C0-2401)
- Korea Institute of Energy Research (C0-2402)
- Korea Institute of Science and Technology Information (KSC-2019-CRE-0056)
- National Research Foundation of Korea (2018R1A2A1A05077194)
- National Research Foundation of Korea (2014R1A5A1009799)
- Korea Institute of Energy Technology Evaluation and Planning (20193091010460)
- KAIST Wearable Platform Material Technology Center (2016R1A5A1009926)
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