Synthesis of Few-Layer GaSe Nanosheets for High Performance Photodetectors

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• 作者：PingAn Hu ; Zhenzhong Wen ; Lifeng Wang ; Pingheng Tan ; Kai Xiao
• 刊名：ACS Nano
• 出版年：2012
• 出版时间：July 24, 2012
• 年：2012
• 卷：6
• 期：7
• 页码：5988-5994
• 全文大小：435K
• 年卷期：v.6,no.7(July 24, 2012)
• ISSN：1936-086X

文摘

Two-dimensional (2D) semiconductor nanomaterials hold great promises for future electronics and optics. In this paper, a 2D nanosheets of ultrathin GaSe has been prepared by using mechanical cleavage and solvent exfoliation method. Single- and few-layer GaSe nanosheets are exfoliated on an SiO₂/Si substrate and characterized by atomic force microscopy and Raman spectroscopy. Ultrathin GaSe-based photodetector shows a fast response of 0.02 s, high responsivity of 2.8 AW^鈥? and high external quantum efficiency of 1367% at 254 nm, indicating that the two-dimensional nanostructure of GaSe is a new promising material for high performance photodetectors.

Keywords:

gallium selenide; nanosheets; photodetectors