• 文献标题:   Graphene/HgTe Quantum-Dot Photodetectors with Gate-Tunable Infrared Response
  • 文献类型:   Article
  • 作  者:   TANG X, LAI KWC
  • 作者关键词:   graphene/hgte cqds junction, infrared, gatetunable photoresponse, photovoltaic detection, interfacial photocarrier transport
  • 出版物名称:   ACS APPLIED NANO MATERIALS
  • ISSN:   2574-0970
  • 通讯作者地址:   City Univ Hong Kong
  • 被引频次:   3
  • DOI:   10.1021/acsanm.9b01587
  • 出版年:   2019

▎ 摘  要

Graphene-based vertical heterostructures are of great interest as emerging electronic and optoelectronic devices. Here, we report the study of photovoltaic response from graphene/HgTe quantum-dot junction. The graphene/HgTe quantum-dot junction combines the high carrier mobility of graphene and tunable infrared optical absorption of HgTe colloidal quantum dots, which offers promising route for the next-generation infrared optoelectronics. We demonstrate that both the sign and magnitude of the short-circuit photocurrents and open-circuit voltages can be controlled by the applied gate voltage, which tunes the Fermi level and the interfacial built-in potential across the junction. The interfacial energy band diagram is deduced to provide the fundamental understanding of the essential physics behind the graphene/quantum-dot film junction.