Issue 24, 2017

Fast gate-tunable photodetection in the graphene sandwiched WSe2/GaSe heterojunctions

Abstract

We investigated electrical and photoelectrical properties of graphene sandwiched WSe2/GaSe van der Waals heterojunctions. The device showed a high rectification ratio up to 300 at Vds = 1.5/−1.5 V, which is attributed to the built-in electric field in the device. Due to the bipolar property of WSe2, gate-tunable rectification inversion was observed. Meanwhile, the graphene sandwiched heterojunction showed excellent performances on photodetection, where the photoresponsivity of (6.2 ± 0.2) A W−1 can be reached under Vds = −1.5 V and P = 0.2 μW. The device also showed great external quantum efficiency of (1490 ± 50)% and fast response time of ∼30 μs. Our study identified the graphene sandwiched heterojunctions based on 2D materials have great potential for gate-tunable electronic and optoelectronic applications.

Graphical abstract: Fast gate-tunable photodetection in the graphene sandwiched WSe2/GaSe heterojunctions

Supplementary files

Article information

Article type
Paper
Submitted
03 Maijs 2017
Accepted
26 Maijs 2017
First published
27 Maijs 2017

Nanoscale, 2017,9, 8388-8392

Fast gate-tunable photodetection in the graphene sandwiched WSe2/GaSe heterojunctions

X. Wei, F. Yan, Q. Lv, C. Shen and K. Wang, Nanoscale, 2017, 9, 8388 DOI: 10.1039/C7NR03124F

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