Journal
ADVANCED MATERIALS
Volume 31, Issue 25, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901519
Keywords
flexible solar cells; mechanical stability; perovskite solar cells; photo-crosslinking
Categories
Funding
- Natural Science Foundation of China [91733301, 61674109, 11605278, 11675252]
- National Key R&D Program of China [2016YFA0202400, 2017YFA0403400]
- Natural Science Foundation of Jiangsu Province [BK20170059]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2018KF07]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
- Helmholtz-Zentrum Berlin fur Materialien und Energie GmbH
- OCPC
- Soochow University (Chinese home organization)
- Ministry of Science and Technology, Taiwan [MOST107-3017-F009-003]
- Center for Emergent Functional Matter Science of National Chiao Tung University from The Featured Areas Research Center Program within Ministry of Education (MOE) in Taiwan
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Halide perovskite films processed from solution at low-temperature offer promising opportunities to make flexible solar cells. However, the brittleness of perovskite films is an issue for mechanical stability in flexible devices. Herein, photo-crosslinked [6,6]-phenylC(61)-butyric oxetane dendron ester (C-PCBOD) is used to improve the mechanical stability of methylammonium lead iodide (MAPbI(3)) perovskite films. Also, it is demonstrated that C-PCBOD passivates the grain boundaries, which reduces the formation of trap states and enhances the environmental stability of MAPbI(3). Thus, MAPbI(3) perovskite solar cells are prepared on solid and flexible substrates with record efficiencies of 20.4% and 18.1%, respectively, which are among the highest ever reported for MAPbI(3) on both flexible and solid substrates. The result of this work provides a step improvement toward stable and efficient flexible perovskite solar cells.
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