Ba-induced phase segregation and band gap reduction in mixed-halide inorganic perovskite solar cells

被引：125

作者：

Xiang, Wanchun ^{[1
,2
]}

Wang, Zaiwei ^{[2
]}

Kubicki, Dominik J. ^{[3
,4
,8
]}

Wang, Xueting ^{[5
,6
]}

Tress, Wolfgang ^{[2
]}

Luo, Jingshan ^{[3
,7
]}

Zhang, Jiahuan ^{[2
]}

Hofstetter, Albert ^{[4
]}

Zhang, Lijun ^{[5
,6
]}

Emsley, Lyndon ^{[4
]}

Graetzel, Michael ^{[3
]}

Hagfeldt, Anders ^{[2
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China

[2] Ecole Polytech Fed Lausanne, Lab Photomol Sci, Inst Chem Sci Engn, CH-1015 Lausanne, Switzerland

[3] Ecole Polytech Fed Lausanne, Lab Photon & Interfaces, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland

[4] Ecole Polytech Fed Lausanne, Lab Magnet Resonance, Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland

[5] Jilin Univ, State Key Lab Superhard Mat, Key Lab Automobile Mat MOE, Changchun 130012, Jilin, Peoples R China

[6] Jilin Univ, Sch Mat Sci & Engn, Changchun 130012, Jilin, Peoples R China

[7] Nankai Univ, Inst Photoelect Thin Film Devices & Technol, Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China

[8] Cavendish Lab, JJ Thomson Ave,Kapitza Bldg K26, Cambridge CB3 0HE, England

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

基金：

美国国家科学基金会; 瑞士国家科学基金会;

关键词：

TOTAL-ENERGY CALCULATIONS; HYBRID PEROVSKITES; EFFICIENCY; DEGRADATION; GENERATION; CSPBI2BR; TIN;

D O I：

10.1038/s41467-019-12678-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

All-inorganic metal halide perovskites are showing promising development towards efficient long-term stable materials and solar cells. Element doping, especially on the lead site, has been proved to be a useful strategy to obtain the desired film quality and material phase for high efficient and stable inorganic perovskite solar cells. Here we demonstrate a function by adding barium in CsPbl(2)Br. We find that barium is not incorporated into the perovskite lattice but induces phase segregation, resulting in a change in the iodide/bromide ratio compared with the precursor stoichiometry and consequently a reduction in the band gap energy of the perovskite phase. The device with 20 mol% barium shows a high power conversion efficiency of 14.0% and a great suppression of non-radiative recombination within the inorganic perovskite, yielding a high open-circuit voltage of 1.33 V and an external quantum efficiency of electroluminescence of 10(-4).

引用

页数：8

共 42 条

[1] Interstitial Mn2+-Driven High-Aspect-Ratio Grain Growth for Low-Trap-Density Microcrystalline Films for Record Efficiency CsPbl2Br Solar Cells [J].