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Wenfeng Xiang,Dong Li,Minghao Hu,Wenzheng Yue,Haizhong Guo 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.5
Single-layer MoS$_2$ films were deposited on sapphire substrates by using pulsed laser deposition. The substrate temperature dependence of the structural, optical and photoluminescence properties of single-layer MoS$_2$ films was investigated. An increased substrate temperature improved the surface morphology and the crystal quality of the MoS$_2$ films. Moreover, the absorption and the photoluminescence properties of the MoS$_2$ films were enhanced. In addition, the mechanism underlying the effect of substrate temperature on the properties of single-layer MoS$_2$ films is discussed.
Shaohua Chen,Xuan Liu,Shengyang Dai,Wenfeng Xiang,Haizhong Guo,Junjian Li 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2
CuxO (Cupric Oxide) nanotubes (NTs) were synthesized by using thermal oxidation of Cu nanowires (NWs) for 2 and 4 hours, respectively, and the effect of the components on their photoelectrical properties due to the infrared (IR) light with a wavelength of 1064 nm were investigated. In the 2-h CuxO NTs, the main component was Cu2O; however, the 4-h CuxO NTs were composed of a mixture of CuO and Cu2O. The photoelectric properties showed that the voltage difference and the sensitivity of 4-h CuxO NTs were more than 3 times those of the 2-h CuxO NTs, and its linear range was only about one-third that of the 2-h CuxO NTs. The above results were caused by the 4-h CuxO NTs containing a higher content of CuO, which had a suitable bandgap of 1.2 eV for light with a wavelength of 1064 nm. In addition, the response and the recovery times for the 4-h NTs were on the same order as those of the 2-h NTs. The conclusions from this article indicated that 4-h and 2-h NTs were very promising for the design of IR photodetector device with higher sensitivity and a larger detection range respectively.