Ultra-flexible and rollable 2D-MoS2/Si heterojunction-based near-infrared photodetector via direct synthesis. Issue 2 (21st December 2020)

• Record Type: Journal Article
• Authors: Choi, Jung-Min; Jang, Hye Yeon; Kim, Ah Ra; Kwon, Jung-Dae; Cho, Byungjin; Park, Min Hyuk; Kim, Yonghun
• Is Part Of: Nanoscale. Volume 13:Issue 2(2021)
• Page Start: 672
• Page End: 680
• Publication Date: 2020-12-21
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d0nr07091b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Flexible and rollable MoS2 /Si photodetector reveals excellent high flexibility, rollability as well as durability under harsh bending conditions. Abstract : Atomic two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for application in various optoelectronic devices such as image sensors, biomedical imaging systems, and consumer electronics and in diverse spectroscopic analyses. However, a complicated fabrication process, involving transfer and alignment of as-synthesized 2D layers onto flexible target substrates, hinders the development of flexible high-performance heterojunction-based photodetectors. Herein, an ultra-flexible 2D-MoS2 /Si heterojunction-based photodetector is successfully fabricated through atmospheric-pressure plasma enhanced chemical vapor deposition, which enables the direct deposition of multi-layered MoS2 onto a flexible Si substrate at low temperature (<200 °C). The photodetector is responsive to near infrared light ( λ = 850 nm), showing responsivity of 10.07 mA W −1 and specific detectivity ( D *) of 4.53 × 10 10 Jones. The measured photocurrent as a function of light intensity exhibits good linearity with a power law exponent of 0.84, indicating negligible trapping/de-trapping of photo-generated carriers at the heterojunction interface, which facilitates photocarrier collection. Furthermore, the photodetectors can be bent with a small bending radius (5 mm) and wrapped around a glass rod, showing excellent photoresponsivity under various bending radii. Hence, the device exhibits excellent flexibility, rollability, and durability under harsh bending conditions. This photodetector has significant potential for use in next-generation flexible and patchable optoelectronic devices.