期刊
ADVANCED FUNCTIONAL MATERIALS
卷 28, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201804349
关键词
bandgap engineering; methylaminium lead halides perovskites; optoelectronics; perovskite photodetectors; single-crystalline arrays
类别
资金
- MOST of China [2017YFA0204504]
- National Natural Science Foundation [21703268, 21633014]
- Beijing Natural Science Foundation [2182081]
- Natural Science Foundation of Jiangsu Province [BK20170330]
Bandgap engineering of single-crystal lead halide perovskites with remarkable optoelectronic properties, solution processability, and low-cost nature has been in the forefront of extensive optoelectronic applications. Yet one imminent challenging is to pattern micro- and nanostructured perovskite arrays with controlled morphology, precision alignment, and high-quality single crystallinity owing to the difference of crystallization behaviors between perovskites with diverse halide stoichiometry, leading to the restricted integration of optoelectronic devices. Herein, a facile assembly solution process is developed through cautious regulation, directional dewetting, and microstructured confinement for the nucleation and growth of 1D perovskite single-crystal arrays with engineered bandgap from 1.7 to 3.1 eV by changing halogen ratios. Photodetectors based on 1D arrays perform a high responsivity of 3.16 x 10(3) A W-1. In comparison with devices based on perovskite thin film, a notable improvement is achieved owing to the elimination of the carrier recombination in the 1D high-quality crystalline arrays with the low defect density and long carrier lifetime. This work offers a new insight for the bandgap engineering of patterned single crystals toward the integration of optoelectronic devices.
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