• 文献标题:   Near unity charge separation efficiency leads to pure ultraviolet emission in few layer graphene nanosheets
  • 文献类型:   Article
  • 作  者:   HE XX, ZHAO LT, ZHOU ZH, ZHANG SJ, PAN HF, CHEN JQ, XU JH
  • 作者关键词:   charge separation, deep uv emission, solar blind photoresponse, few layer graphene nanosheets gns
  • 出版物名称:   NANOTECHNOLOGY
  • ISSN:   0957-4484 EI 1361-6528
  • 通讯作者地址:   East China Normal Univ
  • 被引频次:   0
  • DOI:   10.1088/1361-6528/ab0afe
  • 出版年:   2019

▎ 摘  要

Two-dimensional materials with van der Waals structure attract intense interest due to their high performance in ultrathin optoelectronic devices. In particular, the high efficiency charge separation between the two-dimensional materials can significantly improve the photo-response of a given device. Here we report the discovery of pure ultraviolet (UV) emission from few layer graphene nanosheets (GNS). Near unity charge separation efficiency is key to pure UV emission. The dynamics of an excited electron were analyzed using femtosecond transient absorption techniques. Electron transfer is observed from surface defect states induced by oxygen-containing functional groups to intrinsic sp(2) domain states in few layer GNS. Moreover, a solar blind response device based on few layer GNS with a high on-off ratio was successfully fabricated.