Journal
CELL REPORTS PHYSICAL SCIENCE
Volume 1, Issue 9, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.xcrp.2020.100180
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Funding
- National Natural Science Foundation of China [61974086, 61904100]
- Joint Talent Cultivation Funds of NSFC-HN [U1604138]
- National Key Research and Development Program of China [2016YFA0202403]
- DNL Cooperation Fund CAS [DNL180311]
- Chinese National 1000 Talent Plan Program [1110010341]
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CsPbI3 perovskite has drawn worldwide attention because of its thermal stability and outstanding photovoltaic performance. However, further improvement of CsPbI3 device performance is hindered by significant energy losses via charge-carrier recombination at the CsPbI3/transport layer interface and moisture sensitivity. Here, a beach-chair-shaped band structure is designed to introduce energy level gradients at both sides of the perovskite layer to steer optimal energy band alignment and heterojunction interface passivation in beta-CsPbI3 perovskite solar cells (PSCs), resulting in sup. pressed interfacial recombination, enhanced charge extraction, and more robust stability. As a result, champion solar cell efficiency is increased to as much as 17 12%, one of the highest in reported CsPbI3 PSCs, and the V-oc of 1.15 V is among the highest reported values. Furthermore, bare PSCs without encapsulation retain 90.4% of their initial cell efficiency after being stored for 1 month under ambient conditions.
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