Polarization-sensitive photodetectors based on three-dimensional molybdenum disulfide (MoS₂) field-effect transistors

Abstract

The molybdenum disulfide (MoS2)-based photodetectors are facing two challenges: the insensitivity to polarized light and the low photoresponsivity. Herein, three-dimensional (3D) field-effect transistors (FETs) based on monolayer MoS2 were fabricated by applying a self–rolled-up technique. The unique microtubular structure makes 3D MoS2 FETs become polarization sensitive. Moreover, the microtubular structure not only offers a natural resonant microcavity to enhance the optical field inside but also increases the light-MoS2 interaction area, resulting in a higher photoresponsivity. Photoresponsivities as high as 23.8 and 2.9 A/W at 395 and 660 nm, respectively, and a comparable polarization ratio of 1.64 were obtained. The fabrication technique of the 3D MoS2 FET could be transferred to other two-dimensional materials, which is very promising for high-performance polarization-sensitive optical and optoelectronic applications.

3D‐Structured Photodetectors Based on 2D Transition‐Metal Dichalcogenide

“…Subsequently, the enhancement of optical absorption can induce an increase in the number of photo-generated carriers, resulting in a rise in the photocurrent of the rolledup photodetector. Deng et al [107] reported a self-rolled up 3D MoS 2 photodetector. This distinct 3D tubular structure functions as an optical resonator and enables the 3D MoS 2 field-effect transistor (FET) to detect linear polarized light in addition to enhanced photodetection efficiency.…”

Unconventional van der Waals heterostructures beyond stacking

“…In the 2D case, graphene along with patterned contacts, supported on strained SiN x layer pairs and released by etching of a sacrificial Al film, is rolled up into a cylindrical FET photodetector. A similar fabrication method has been reported for other 2D crystals, including MoS 2 ( Deng et al., 2020 ), while alternative approaches use evaporated bimetallic strips both for rolling and as device contacts ( Zhou et al., 2019 ). The cylindrical graphene FET photodetectors demonstrated efficient photodetection in the UV, visible, mid-infrared, and terahertz (THz) regions, while MoS 2 scrolls showed polarization-dependent photocurrent, where symmetry breaking results from the cylindrical geometry of the detector.…”

Highly Sensitive Photodetectors Based on Monolayer MoS2 Field-Effect Transistors

“… 13 Therefore, MoS 2 has recently attracted more and more research attention in high-performance photodetectors. 7 , 14 …”