How Lead Halide Complex Chemistry Dictates the Composition of Mixed Halide Perovskites

被引：173
|
作者：
Yoon, Seog Joon [1 ,2 ]
Stamplecoskie, Kevin G. [1 ,4 ]
Kamat, Prashant V. [1 ,2 ,3 ]
机构：
[1] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA
[2] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA
[3] Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
[4] Queens Univ, Kingston, ON K7L 3N6, Canada
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2016年 / 7卷 / 07期
关键词：
SOLAR-CELLS; PHOTOVOLTAIC EFFICIENCY; HYBRID PEROVSKITES; EXCITED-STATE; EVOLUTION; RECOMBINATION; PERFORMANCE; CHLORIDE; FILMS; CH(3)NH(3)PBL(3);
D O I：
10.1021/acs.jpclett.6b00433
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Varying the halide ratio (e.g., Br-:I-) is a convenient approach to tune the bandgap of organic lead halide perovskites. The complexation between Pb2+ and halide ions is the primary step in dictating the overall composition, and optical properties of the annealed perovskite structure. The complexation between Pb2+ and Br- is nearly 7 times greater than the complexation between Pb2+ and I-, thus making Br- a dominant binding species in mixed halide systems. Emission and transient absorption measurements show a strong dependence of excited state behavior on the composition of halide ions employed in the precursor solution. When excess halide (X = Br- and I-) are present in the precursor solution (0.3 M PbX2 and 0.9 M CH3NH3X), the exclusive binding of Pb2+ with Br- results in the formation of CH3NH3PbBr3 perovskites as opposed to mixed halide perovskite.
引用
收藏
页码：1368 / 1373
页数：6
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