Journal
NANO ENERGY
Volume 27, Issue -, Pages 561-568Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2016.08.001
Keywords
Planar perovskite solar cell; PC61BM buffer layer; PbI2-xCL precursor film; Porous structure; Surface passivation
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Funding
- Ministry of Science and Technology [2014DFE60170]
- National Natural Science Foundation of China [61474065, 61504069]
- Tianjin Research Key Program of Application Foundation and Advanced Technology [15JCZDJ01300]
- Key Project in the Science & Technology Pillar Program of Jiangsu Province [BE2014147-3]
- 111 Project [B16027]
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A thin PC61BM buffer layer (BL) has been introduced between TiO2 electron transporting layer and perovskite absorber in n-i-p planar perovskite solar cells (PSCs). We have found that the elastic nature of the PC61BM BL promotes the formation of porous Pbl(2-x)Cl(x) thin film with loose structure, which is vital in the following formation of high quality, uniform perovskite films with large grain size. In addition, it has been demonstrated that the thin PC61BM BL also flattens the TiO2 surface, passivates the defects or dangling bands parasitizing on the TiO2 surface, and optimizes the device band alignment. As a result, the device efficiency has been enhanced dramatically from 8.37% to 15.44%. Moreover, devices show a good stability over 400 h and reproducibility in 20 pieces fabricated with the same procedure, which implies that this finding is benefit for fabricating highly efficient PSCs. We introduced a thin PC61BM buffer layer between the TiO2 electron transport layer and the perovskite absorber in n-i-p planar perovskite solar cells, which facilitates the construction of a porous Pbl(2-x)Cl precursor film, and thus promotes the following realization of high quality, uniform perovskite films with large grain size and improves the solar cell efficiency significantly. (C) 2016 Elsevier Ltd. All rights reserved.
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