title: High Efficiency Inverted Planar Perovskite Solar Cells with Solution-Processed NiOxHole Contact.
abstract: NiOxis a promising hole-transporting material for perovskite solar cells due to its high hole mobility, good stability, and easy processability. In this work, we employed a simple solution-processed NiOxfilm as the hole-transporting layer in perovskite solar cells. When the thickness of the perovskite layer increased from 270 to 380 nm, the light absorption and photogenerated carrier density were enhanced and the transporting distance of electron and hole would also increase at the same time, resulting in a large charge transfer resistance and a long hole-extracted process in the device, characterized by the UV-vis, photoluminescence, and electrochemical impedance spectroscopy spectra. Combining both of these factors, an optimal thickness of 334.2 nm was prepared with the perovskite precursor concentration of 1.35 M. Moreover, the optimal device fabrication conditions were further achieved by optimizing the thickness of NiOxhole-transporting layer and PCBM electron selective layer. As a result, the best power conversion efficiency of 15.71% was obtained with a Jscof 20.51 mA·cm-2, a Vocof 988 mV, and a FF of 77.51% with almost no hysteresis. A stable efficiency of 15.10% was caught at the maximum power point. This work provides a promising route to achieve higher efficiency perovskite solar cells based on NiO or other inorganic hole-transporting materials.
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Xuewen
authors.initials: X
authors.lastname: Yin
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Zhibo
authors.initials: Z
authors.lastname: Yao
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Luo
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Xuezeng
authors.initials: X
authors.lastname: Dai
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Yangying
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Songping
authors.initials: S
authors.lastname: Luo
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.|State Key Laboratory of Marine Resource Utilization in South China Sea, Materials and Chemical Engineering Institute, Hainan University , Haikou 570228, China.
authors.forename: Jianbao
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Marine Resource Utilization in South China Sea, Materials and Chemical Engineering Institute, Hainan University , Haikou 570228, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.affiliation: State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, P. R. China.
authors.forename: Hong
authors.identifier: http://orcid.org/0000-0002-3382-5960
authors.initials: H
authors.lastname: Lin
keywords: high efficiency; hole-transporting layer; inverted planar structure; perovskite solar cells; undoped nickel oxide