Switching from Negative to Positive Photoconductivity toward Intrinsic Photoelectric Response in InAs Nanowire

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• 作者：Yuxiang Han ; Mengqi Fu ; Zhiqiang Tang ; Xiao Zheng ; Xianghai Ji ; Xiaoye Wang ; Weijian Lin ; Tao Yang ; Qing Chen
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：9
• 期：3
• 页码：2867-2874
• 全文大小：565K
• ISSN：1944-8252

文摘

Negative photoconductivity (NPC) and positive photoconductivity (PPC) are observed in the same individual InAs nanowires grown by metal–organic chemical vapor deposition. NPC displays under weak light illumination due to photoexcitation scattering centers charged with hot carrier in the native oxide layer. PPC is observed under high light intensity. Through removing the native oxide layer and passivating the nanowire with HfO₂, we eliminate the NPC effect and realize intrinsic photoelectric response in InAs nanowire.