Novel insight into the function of PC61BM in efficient planar perovskite solar cells. (September 2016)

• Record Type: Journal Article
• Authors: Fan, Lin; Ding, Yi; Shi, Biao; Wei, Changchun; Zhang, Dekun; Xie, Jiangsheng; Yu, Xuegong; Yan, Baojie; Zhao, Ying; Zhang, Xiaodan
• Is Part Of: Nano energy. Volume 27(2016:Sep.)
• Page Start: 561
• Page End: 568
• Publication Date: 2016-09
• Subjects: Planar perovskite solar cell -- PC61BM buffer layer -- PbI2−xClx precursor film -- Porous structure -- Surface passivation; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.08.001
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: A thin PC61 BM 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 PC61 BM BL promotes the formation of porous PbI2−x Clx 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 PC61 BM 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 PC61 BM 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 PbI2−x Clx 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. Graphical abstract: We introduced a thin PC61 BM 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 PbI2−x Clx 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. Highlights: A thin PC61 BM layer has been employed between ETL and perovskite layer. Porous PbI2−x Clx film has been realized after employing PC61 BM. Porous PbI2−x Clx facilitates high quality perovskite film formation. Planar solar cell PCE has been enhanced from 8.37% to 15.44%.