Journal
ADVANCED MATERIALS
Volume 32, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001479
Keywords
interfacial engineering; lattice distortion; perovskite solar cells; silane coupling agents; strain
Categories
Funding
- Natural Science Foundation of China [61674109, 91733301]
- National Key R&D Program of China [2016YFA0202402]
- Natural Science Foundation of Jiangsu Province [BK20170059]
- China Postdoctoral Science Foundation [2015M580460]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2018KF07]
- Academic Research Grant in Toshiba Electronic Devices and Storage Corp.
- 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
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Interface strains and lattice distortion are inevitable issues during perovskite crystallization. Silane as a coupling agent is a popular connector to enhance the compatibility between inorganic and organic materials in semiconductor devices. Herein, a protonated amine silane coupling agent (PASCA-Br) interlayer between TiO(2)and perovskite layers is adopted to directionally grasp both of them by forming the structural component of a lattice unit. The pillowy alkyl ammonium bromide terminals at the upper side of the interlayer provide well-matched growth sites for the perovskite, leading to mitigated interface strain and ensuing lattice distortion; meanwhile, its superior chemical compatibility presents an ideal effect on healing the under-coordinated Pb atoms and halogen vacancies of bare perovskite crystals. The PASCA-Br interlayer also serves as a mechanical buffer layer, inducing less cracked perovskite film when bending. The developed molecular-level flexible interlayer provides a promising interfacial engineering for perovskite solar cells and their flexible application.
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