Lead-Free, Two-Dimensional Mixed Germanium and Tin Perovskites

被引：105

作者：

Cheng, Pengfei ^{[1
,2
]}

Wu, Tao ^{[1
]}

Liu, Junxue ^{[1
]}

Deng, Wei-Qiao ^{[1
,3
]}

Han, Keli ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Shandong Univ, Inst Mol Sci & Engn, Qingdao 266000, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2018年 / 9卷 / 10期

基金：

中国国家自然科学基金;

关键词：

METAL-HALIDE PEROVSKITES; LIGHT-EMITTING DEVICES; PHOTOVOLTAIC APPLICATIONS; IODIDE; SEMICONDUCTORS; NANOCRYSTALS; PERFORMANCE; STABILITY; ABSORBER; EMISSION;

D O I：

10.1021/acs.jpclett.8b00871

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：

Hybrid two-dimensional (2D) organic-inorganic perovskites continue to draw increased attention in view of their outstanding performance in optoelectronic devices such as solar cells and light-emitting devices. Herein, for the first time, we report the synthesis and characterization of lead-free, 2D mixed Ge-Sn halide perovskites, (PEA)(2)Ge1xSnxI4 (where PEA = C6H5CH2CH2NH3+), and demonstrate that the bandgaps decrease linearly with increasing Sn content. Most importantly, among them, (PEA)(2)Ge0.5Sn0.5I4 possesses the smallest bandgap of 1.95 eV. Density functional theory calculations confirm that Sn substitution induces a smaller bandgap and more dispersed band structure, which are desirable characteristics of light-absorbing materials. In addition, conductivity and stability of (PEA)(2)Ge0.5Sn0.5I4 have also been assessed.

引用

页码：2518 / 2522

页数：9

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