4.8 Article

A fresh-bias photoresponse of graphene field-effect transistor: An electrical tunable fast dipole moment generation

期刊

CARBON
卷 173, 期 -, 页码 322-328

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.11.022

关键词

Graphene field-effect transistor; Photoresponse; Back-gate voltage; Dipole moment

资金

  1. National Natural Science Foundation of China [61671368, 61172041, 91123018, 61404103]
  2. Science and Technology on Analog Integrated Circuit Laboratory [614280205040617]
  3. Science and Technology Planning Project of Guangdong Province, China [2017A010103004]
  4. Basic Public Welfare Research Planning Project of Zhejiang Province [LGG19F040002]
  5. Fundamental Research Funds for the Central Universities

向作者/读者索取更多资源

A unique photoresponse of graphene field-effect transistor to laser pulse after a switch of back-gate voltage, referred as fresh-bias photoresponse (FBPR), is reported. FBPR suggests a prompt charge transfer process triggered by laser illumination, and the transferred charge remains as long as the back-gate voltage remains unchanged. This mechanism may offer a new approach for developing phototransistors, photodetectors or photoelectronic memory devices in the future.
A unique extra photoresponse of graphene field-effect transistor to the first laser pulse after a switch of back-gate voltage (V-BG) is reported and explored here. It is referred as fresh-bias photoresponse (FBPR). FBPR suggests a unique prompt charge transfer process triggered by laser illumination with the help of the V-BG and the transferred charge holds as far as the V-BG holds unchanged. The responsible charge transfer process is proposed between ester oxygen and carbonyl carbon atoms in the ester side chains of poly(methyl methacrylate) (PMMA) molecule. The proposed mechanism explains perfectly all of the features of FBPR. The charge transfer process generates an inter-molecular dipole moment of PMMA. Such dipole moment generation is much fast than that introduced by a photo-triggered isomerization reaction of photochromic molecule, which have been used in graphene based photodetectors. This mechanism is further confirmed by the test result of a control device with mechanically exfoliated graphene channel and a control device fabricated on hexagonal boron nitride substrate. The mechanism behind FBPR may provide a new way of developing phototransistors, photodetectors or photoelectronic memory devices in the future. (C) 2020 Elsevier Ltd. All rights reserved.

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