title: Efficient inorganic solid solar cells composed of perovskite and PbS quantum dots.
abstract: Lead halide perovskite solar cells have attracted great interest due to their high efficiency and simple fabrication process. However, the high efficiency heavily relies on expensive organic hole-transporting materials (OHTMs) such as 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-MeOTAD), it is preferable to replace these expensive OHTMs by inorganic and low cost materials. Here, we report colloidal PbS quantum dots synthesized by a facile method and used as the inorganic hole-transporting material in a hybrid perovskite solar cell. By controlling the crystalline morphology of the perovskite capping layer, the recombination process is significantly retarded. Furthermore, a pure inorganic solar cell prepared by a two-step process demonstrated a nearly 8% power conversion efficiency due to efficient charge separation by a cascade of junctions and retarding charge recombination by a void-free capping layer. The stability of the inorganic solar cell was also tested with a little decay observed within ca. 100 h.
authors.affiliation: Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.forename: Yang
authors.initials: Y
authors.lastname: Huang
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wei
authors.forename: Feng
authors.initials: F
authors.lastname: Liu
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Shao
authors.forename: Linhua
authors.initials: L
authors.lastname: Hu
authors.forename: Shuanghong
authors.initials: S
authors.lastname: Chen
authors.forename: Shangfeng
authors.initials: S
authors.lastname: Yang
authors.forename: Junwang
authors.initials: J
authors.lastname: Tang
authors.forename: Jianxi
authors.initials: J
authors.lastname: Yao
authors.forename: Songyuan
authors.initials: S
authors.lastname: Dai