High-performance UV photodetectors and temperature-dependent photoluminescence of individual ZnO hexagonal-prism microwire
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ZnO hexagonal-prism microwires (HPMs) with the average width of about 50 μm have been fabricated by a floating zone method. Their structural, temperature-dependent photoluminescence (PL) and UV photoresponse based on an individual ZnO HPMs were systematically investigated. For the temperature-dependent PL properties, different transitions including free exciton emission, bound exciton emission and free-to-bound transition were clearly observed at 83 K. The individual ZnO HPM-based UV photodetector showed a response cut-off wavelength of 390 nm and an ultraviolet/visible ratio of about two orders of magnitude with an applied bias of 5 V.
KeywordsApplied Bias Free Exciton Phonon Replica Floating Zone Method Photoconductive Property
This work is supported by National Basic Research Program of China (973 Program) under Grant No. 2011CB302004, the National Natural Science Foundation of China (Grant Nos. 11304120, 11304121), the Encouragement Foundation for Excellent Middle-aged and Young Scientist of Shandong Province (Grant Nos. BS2012CL005, BS2013CL020), Doctoral foundation of University of Jinan (UJN) (Grant No. XBS1326). Thanks University of Jinan (UJN) for the support on new staff, and the project supported by the Taishan Scholar (No. TSHW20120210).