Enhanced Photoluminescence and Solar Cell Performance via Lewis Base Passivation of Organic Inorganic Lead Halide Perovskites

被引:1520
作者
Noel, Nakita K. [1 ]
Abate, Antonio [1 ]
Stranks, Samuel D. [1 ]
Parrott, Elizabeth S. [1 ]
Burlakov, Victor M. [2 ]
Goriely, Alain [2 ]
Snaith, Henry J. [1 ]
机构
[1] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
[2] Univ Oxford, Math Inst, Radcliffe Observ Quarter, Oxford OX2 6GG, England
基金
英国工程与自然科学研究理事会;
关键词
organic-inorganic perovskite; coordinate bonding; perovskite solar cells; surface passivation; under-coordinated atoms; photoluminescence; defect sites; FILMS; CH3NH3PBI3; TRIHALIDE;
D O I
10.1021/nn5036476
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Organic-inorganic metal halide perovskites have recently emerged as a top contender to be used as an absorber material in highly efficient, low-cost photovoltaic devices. Solution-processed semiconductors tend to have a high density of defect states and exhibit a large degree of electronic disorder. Perovskites appear to go against this trend, and despite relatively little knowledge of the impact of electronic defects, certified solar-to-electrical power conversion efficiencies of up to 17.9% have been achieved. Here, through treatment of the crystal surfaces with the Lewis bases thiophene and pyridine, we demonstrate significantly reduced nonradiative electron-hole recombination within the CH3NH3PbI3-xClx perovskite, achieving photoluminescence lifetimes which are enhanced by nearly an order of magnitude, up to 2 mu s. We propose that this is due to the electronic passivation of under-coordinated Pb atoms within the crystal. Through this method of Lewis base passivation, we achieve power conversion efficiencies for solution-processed planar heterojunction solar cells enhanced from 13% for the untreated solar cells to 15.3% and 16.5% for the thiophene and pyridine-treated solar cells, respectively.
引用
收藏
页码:9815 / 9821
页数:7
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