Thermochromism to tune the optical bandgap of a lead-free perovskite-type hybrid semiconductor for efficiently enhancing photocurrent generation

被引:40
作者
Zhang, Weichuan [1 ]
Sun, Zhihua [1 ]
Zhang, Jing [1 ]
Han, Shiguo [1 ]
Ji, Chengmin [1 ]
Li, Lina [1 ]
Hong, Maochun [1 ]
Luo, Junhua [1 ]
机构
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China
关键词
HALIDE PEROVSKITES; SOLAR-CELLS; DESIGN; CRYSTALS; CL;
D O I
10.1039/c7tc02721d
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Thermochromic materials have recently attracted great attention due to their controllable and rich physicochemical properties. However, until now, no studies have been reported on thermochromic materials for photovoltaic and optoelectronic applications. Here we report a new lead-free hybrid semiconductor material, (C16H20N2)SbBr5 (1), which adopts the zero-dimensional (0-D) perovskite-type inorganic framework. Strikingly, the thermochromism in 1 leads to a wide tunable bandgap and superior photoelectric properties. Three distinct color-varying stages were first observed, i.e. colorless to yellow (I), yellow to red (II), and red to black brown (III). In particular, the figure-of-merits for thin-film photodetectors based on II-thermochromism were greatly improved, with the dark current lowered to one quarter and light photocurrent enhanced at least 12-fold. The photocurrent on/off switching ratio was thus improved by similar to 50 times through thermochromism. As a new conceptual strategy to engineer the optical bandgap and meet specific photoelectric functions, our study paves the way for building high-performance optoelectronic devices based on thermochromic materials.
引用
收藏
页码:9967 / 9971
页数:5
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