Issue 40, 2018

Graphene–silicon-on-insulator (GSOI) Schottky diode photodetectors

Abstract

Graphene–silicon (GS) Schottky junctions have been demonstrated as an efficient architecture for photodetection. However, the response speed of such devices for free space light detection has so far been limited to 10s–100s of kHz for wavelength λ >500 nm. Here, we demonstrate GS Schottky junction photodetectors fabricated on a silicon-on-insulator substrate (SOI) with response speeds approaching 1 GHz, attributed to the reduction of the photo-active silicon layer thickness to 10 μm and with it a suppression of speed-limiting diffusion currents. Graphene–silicon-on-insulator photodetectors (GSOI-PDs) exhibit a negligible influence of wavelength on response speed and only a modest compromise in responsivities compared to GS junctions fabricated on bulk silicon. Noise-equivalent-power (NEP) and specific detectivity (D*) of GSOI photodetectors are 14.5 pW and 7.83 × 1010 cm Hz1/2 W−1, respectively, in ambient conditions. We further demonstrate that combining GSOI-PDs with micro-optical elements formed by modifying the surface topography enables engineering of the spectral and angular response.

Graphical abstract: Graphene–silicon-on-insulator (GSOI) Schottky diode photodetectors

Supplementary files

Article information

Article type
Communication
Submitted
30 জুন 2018
Accepted
01 অক্টো. 2018
First published
02 অক্টো. 2018

Nanoscale, 2018,10, 18926-18935

Graphene–silicon-on-insulator (GSOI) Schottky diode photodetectors

H. Selvi, E. W. Hill, P. Parkinson and T. J. Echtermeyer, Nanoscale, 2018, 10, 18926 DOI: 10.1039/C8NR05285A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements