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Graphene charge-injection photodetectors

We report graphene charge-injection photodetectors. The devices have a deep-depletion silicon well for charge integration, single-layer graphene for non-destructive direct readout and multilayer graphene for infrared photocharge injection.

Published Oct 24, 2022

Yang Xu

Professor, Zhejiang University

Graphene charge-injection photodetectors

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In this Article, we report graphene charge-injection (GCI) photodetectors that combine the charge integration feature of CCD and the independent pixel structure of CMOS. The photodetector consists of a deep-depletion SiO₂/Si well sandwiched between single-layer graphene (SLG) on top of the structure (for direct field-effect readout) and multilayer graphene (MLG) at the bottom (for broadband charge injection). Combined with tunable responsivity, which can be used as the weight, the GCI can be potentially used to build neuromorphic networks. The combination of charge injection, integration and direct independent readout in each pixel could be used to make new imaging devices with applications in various fields.

https://www.nature.com/articles/s41928-022-00755-5

Nature Electronics volume 5, pages 281–288 (2022)

Yang Xu (FInstP)

Professor, Zhejiang University

Prof. Yang Xu is a Fellow of the Institute of Physics (FInstP, IOP Fellow), IEEE NTC Distinguished Lecturer and IEEE Senior Member of the Electron Devices Society. He received his B.S. degree in Institute of Microelectronics at Department of ECE from Tsinghua University, M.S. and Ph.D. degrees in ECE from the University of Illinois Urbana-Champaign (UIUC), USA. He is now a full professor at the School of Micro-Nano Electronics, Zhejiang University, China. He was also a visiting by-Fellow of Churchill College at the University of Cambridge, UK, and a visiting professor at the University of California Los Angles (UCLA). He has published more than 120 papers including Nature Nanotechnology, Nature Electronics, Nature Photonics, Chemical Reviews, Advanced Materials, Chemical Society Reviews, Nature Communications, Nano Letters, ACS Nano, and IEDM,etc. He holds over 30 granted patents and gave more than 50 talks in international conferences. He is also served as Associate Editor of IEEE Nanotechnology Magazine, Microelectronics Journal, Micro & Nano Letters, and IET Circuits, Devices & Systems, Advisory Panel Member of IOP Nanotechnology, and was TPC committee members of IEEE-EDTM, IEEE-IPFA, and IEEE-EDAPS conferences. His research interests include emerging 2D/3D integrated optoelectronic devices for Internet-of-Things and Post-Moore Ubiquitous Electronics.