期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 27, 页码 32263-32269出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08137
关键词
lead halide perovskites; bulk photostriction; single crystals; light-driven actuators; crystal structure; photocarriers
资金
- National Natural Science Foundation of China [51790492, 51721001, 61874055, 51902159]
- National Key Research Program of China [2016YFA0300101]
- Fundamental Research Funds for the Central Universities [30921013108]
By using a 532 nm laser, giant bulk photostriction can be induced in MAPbBr(3-x)I(x) crystals, leading to a linear increase in crystal displacement, which is suitable for precise positioning in light-driven actuators.
It is well known that the lattice structure for a crystal can be manipulated through mechanical strain, temperature, an electric field, a magnetic field, and light. In the past, the photostriction commonly occurs at the surface and the bulk photostriction is very small in most semiconductors. Here, the 532 nm laser can excite the excess electron-hole pairs in the surface layer and consequently these carriers diffuse in the millimeter-thick MAPbBr(3-x)I(x) crystal and introduce a giant bulk photostriction of 0.17, 0.28, and 0.35% for the 0.5 mm-thick MAPbBr(3-x)I(x) single crystals at x = 0, 1, and 2, respectively. Furthermore, the displacement of each crystal linearly increases from hundreds of picometers to several micrometers when the light intensity increases from about 0.2 to 536 mW/cm(2). Since both the maximum strain and the displacement accuracy are as good as those of PZT ceramics used in piezoelectric actuators, these crystals can be used in light-driven actuators for precise positioning.
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