title: Keggin-Type PMo11V as a P-type Dopant for Enhancing the Efficiency and Reproducibility of Perovskite Solar Cells.
abstract: The conventional perovskite solar cells (PSCs) with 2,2',7,7'-tetrakis(N,N-dimethoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) as a hole transporting material commonly suffer from poor stability and reproducibility mainly due to the process of placing the devices in air and illumination for oxidizing the spiro-OMeTAD. Herein, Keggin-type polyoxometalates (POMs)-phosphovanadomolybdate (H4PMo11V·nH2O, denoted as PMo11V) is for the first time employed as a p-type dopant for promoting the oxidation of spiro-OMeTAD. Thereby, without illumination and air, the conductivity and hole extraction efficiency of the PMo11V doped spiro-OMeTAD with assistance of lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) and 4-tert-butylpyridine (TBP) can be dramatically enhanced. On the basis of this strategy, the corresponding PSCs exhibit substantially improved photovoltaic performance and good reproducibility. The best performing device yields a power conversion efficiency (PCE) of 14.05%. This work indicates a great potential of polyoxometalates for further applications in solar cells and other optoelectronics devices.
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China.|College of Chemistry and Chemical Engineering, Qiqihar University , Qiqihar 161006, P. R. China.
authors.forename: Guohua
authors.initials: G
authors.lastname: Dong
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China.
authors.forename: Debin
authors.initials: D
authors.lastname: Xia
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China.
authors.forename: Yulin
authors.identifier: http://orcid.org/0000-0002-2108-662X
authors.initials: Y
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Shenga
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China.
authors.forename: Tengling
authors.initials: T
authors.lastname: Ye
authors.affiliation: MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology , Harbin 150001, P. R. China.
authors.forename: Ruiqing
authors.initials: R
authors.lastname: Fan
keywords: Keggin-type PMo11V; conductivity; hole extracting efficiency; p-type dopant; perovskite solar cells; spiro-OMeTAD