title: Improving the photovoltaic performance of perovskite solar cells with acetate.
abstract: In an all-solid-state perovskite solar cell, methylammonium lead halide film is in charge of generating photo-excited electrons, thus its quality can directly influence the final photovoltaic performance of the solar cell. This paper accentuates a very simple chemical approach to improving the quality of a perovskite film with a suitable amount of acetic acid. With introduction of acetate ions, a homogeneous, continual and hole-free perovskite film comprised of high-crystallinity grains is obtained. UV-visible spectra, steady-state and time-resolved photoluminescence (PL) spectra reveal that the obtained perovskite film under the optimized conditions shows a higher light absorption, more efficient electron transport, and faster electron extraction to the adjoining electron transport layer. The features result in the optimized perovskite film can provide an improved short-circuit current. The corresponding solar cells with a planar configuration achieves an improved power conversion efficiency of 13.80%, and the highest power conversion efficiency in the photovoltaic measurements is up to 14.71%. The results not only provide a simple approach to optimizing perovskite films but also present a novel angle of view on fabricating high-performance perovskite solar cells.
authors.affiliation: Institute of New Energy Material Chemistry, School of Materials Science and Engineering, National Institute of Advanced Materials, Nankai University, Tianjin 300350, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Institute of New Energy Material Chemistry, School of Materials Science and Engineering, National Institute of Advanced Materials, Nankai University, Tianjin 300350, China.
authors.forename: G R
authors.initials: GR
authors.lastname: Li
authors.affiliation: School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Song
authors.affiliation: School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
authors.forename: Yulong
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.
authors.forename: Yinghuai
authors.initials: Y
authors.lastname: Qiang
authors.affiliation: Institute of New Energy Material Chemistry, School of Materials Science and Engineering, National Institute of Advanced Materials, Nankai University, Tianjin 300350, China.
authors.forename: X P
authors.initials: XP
authors.lastname: Gao