Journal
NANO LETTERS
Volume 17, Issue 4, Pages 2482-2489Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00166
Keywords
Methylammonium lead halide perovskite; single-crystalline nanowire arrays; photodetectors; light wavelength measurement
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Funding
- National Basic Research Program of China [2013CB933500, 2016YFA0202400]
- National Natural Science Foundation of China [61422403, 51672180, 51622306, 21673151]
- Qing Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Chinese Scholarship Council
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Compared with polycrystalline films, single-crystalline methyl ammonium lead halide (MAPbX(3), X = halogen) perovskite nanowires (NWs) with well-defined structure possess superior optoelectronic properties for optoelectronic applications. However, most of the prepared perovskite NWs exhibit properties below expectations due to poor crystalline quality and rough surfaces. It also remains a challenge to achieve aligned growth of single crystalline perovskite NWs for integrated device applications. Here, we report a facile fluid-guided antisolvent vapor-assisted crystallization (FGAVC) method for large-scale fabrication of high-quality single-crystalline MAPb(I1-xBrx)(3) (x = 0, 0.1, 0.2, 0.3, 0.4) NW arrays. The resultant perovskite NWs showed smooth surfaces due to slow crystallization process and moisture-isolated growth environment. Significantly, photodetectors made from the NW arrays exhibited outstanding performance in respect of ultrahigh responsivity of 12500 A W-1, broad linear dynamic rang (LDR) of 150 dB, and robust stability. The responsivity represents the best value ever reported for perovskite-based photodetectors. Moreover, the spectral response of the MAPb(I1-xBrx)(3) NW arrays could be sequentially tuned by varying the content of x = 0-0.4. On the basis of this feature, the NW arrays were monolithically integrated to form a unique system for directly measuring light wavelength. Our work would open a new avenue for the fabrication of high-performance, integrated optoelectronic devices from the perovskite NW arrays.
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