High performance, self-powered photodetectors based on a graphene/silicon Schottky junction diode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Dharmaraj Periyanagounder
  • Paulraj Gnanasekar
  • Purushothaman Varadhan
  • Jr-Hau He
  • Jeganathan Kulandaivel

Detail(s)

Original languageEnglish
Pages (from-to)9545-9551
Journal / PublicationJournal of Materials Chemistry C
Volume6
Issue number35
Online published8 Aug 2018
Publication statusPublished - 21 Sep 2018
Externally publishedYes

Abstract

Electron-hole pair separation and photocurrent conversion at two-dimensional (2D) and three-dimensional (3D) hybrid interfaces are important for achieving high performance, self-powered optoelectronic devices such as photodetectors. In this regard, herein, we designed and demonstrated a graphene/silicon (Gr/Si) (2D/3D) van der Waals (vdW) heterostructure for high-performance photodetectors, where graphene acts as an efficient carrier collector and Si as a photon absorption layer. The Gr/Si heterojunction exhibits superior Schottky diode characteristics with a barrier height of 0.76 eV and shows good performance as a self-powered detector, responding to 532 nm at zero bias. The self-powered photodetector functions under the mechanism of photovoltaic effect and exhibits responsivity as high as 510 mA W-1 with a photo switching ratio of 105 and a response time of 130 μs. The high-performance vdW heterostructure photodetector demonstrated herein is attributed to the Schottky barrier that effectively prolongs the lifetime of photo-excited carriers, resulting in fast separation and transport of photoexcited carriers. The self-powered photodetector with superior light harvesting and carrier transport behaviour is expected to open a window for the technological implementation of Si-based monolithic optoelectronic devices.

Citation Format(s)

High performance, self-powered photodetectors based on a graphene/silicon Schottky junction diode. / Periyanagounder, Dharmaraj; Gnanasekar, Paulraj; Varadhan, Purushothaman; He, Jr-Hau; Kulandaivel, Jeganathan.

In: Journal of Materials Chemistry C, Vol. 6, No. 35, 21.09.2018, p. 9545-9551.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal