A Breakthrough Efficiency of 19.9% Obtained in Inverted Perovskite Solar Cells by Using an Efficient Trap State Passivator Cu(thiourea)I

• DOI: 10.1021/jacs.7b01439
• Publication Date: 2017-05-15T13:56:15Z
• Authors: Senyun Ye; Haixia Rao; Ziran Zhao; Linjuan Zhang; Hongliang Bao; Weihai Sun; Yunlong Li; Feidan Gu; Jianqiang Wang; Zhiwei Liu; Zuqiang Bian; Chunhui Huang
• Keywords: Passivation; Penning trap; Trap (plumbing); Carrier lifetime

It is extremely significant to study the trap state passivation and minimize states of perovskite achieve high-performance solar cells (PSCs). Here, we have first revealed demonstrated that a novel p-type conductor Cu(thiourea)I [Cu(Tu)I] incorporated in layer can effectively passivate via interacting with under-coordinated metal cations halide anions at crystal surface. The energy level be shallowed from 0.35-0.45 eV 0.25-0.35 eV. In addition, Cu(Tu)I participate constructing p-i bulk heterojunctions perovskite, leading an increase depletion width 126 265 nm, which advantageous for accelerating hole transport reducing charge carrier recombination. For these two synergistic effects, play much better role than traditional CuI, probably due its identical valence band maximum enables not only lower greater extent but also eliminate potential wells holes heterojunctions. After optimization, breakthrough efficiency 19.9% has been obtained inverted PSCs as passivator perovskite.