Highly Sensitive Mos2 Photodetectors With Graphene Contacts

Keywords

heterostructures; photodetectors; two-dimensional materials

Abstract

Two-dimensional materials such as graphene and transition metal dichalcogenides (TMDs) are ideal candidates to create ultra-thin electronics suitable for flexible substrates. Although optoelectronic devices based on TMDs have demonstrated remarkable performance, scalability is still a significant issue. Most devices are created using techniques that are not suitable for mass production, such as mechanical exfoliation of monolayer flakes and patterning by electron-beam lithography. Here we show that large-area MoS2 grown by chemical vapor deposition and patterned by photolithography yields highly sensitive photodetectors, with record shot-noise-limited detectivities of 8.7 × 1014 Jones in ambient condition and even higher when sealed with a protective layer. These detectivity values are higher than the highest values reported for photodetectors based on exfoliated MoS2. We study MoS2 devices with gold electrodes and graphene electrodes. The devices with graphene electrodes have a tunable band alignment and are especially attractive for scalable ultra-thin flexible optoelectronics.

Publication Date

3-19-2018

Publication Title

Nanotechnology

Volume

29

Issue

20

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/1361-6528/aab4bb

Socpus ID

85044835346 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85044835346

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