Ultrafast and Polarization-Sensitive ReS₂/ReSe₂ Heterostructure Photodetectors with Ambipolar Photoresponse

Abstract

Recently, two-dimensional (2D) van der Waals (vdWs) heterostructures provided excellent and fascinating platforms for advanced engineering in high-performance optoelectronic devices. Herein, novel ReS2/ReSe2 heterojunction phototransistors are constructed and explored systematically that display high responsivity, wavelength-dependent ambipolar photoresponse (negative and positive), ultrafast and polarization-sensitive detection capability. This photodetector exhibits a positive photoresponse from UV to visible spectrum (760 nm) with high photoresponsivities about 126.56 and 16.24 A/W under 350 and 638 nm light illumination, respectively, with a negative photoresponse over 760 nm, which is mainly ascribed to the ambipolar photoresponse modulated by gate voltage. In addition, profound linear polarization sensitivity is demonstrated with a dichroic ratio of about ∼1.2 at 638 nm and up to ∼2.0 at 980 nm, primarily owing to the wavelength-dependent absorption anisotropy and the stagger alignment of the crystal. Beyond static photodetection, the dynamic photoresponse of this vdWs device presents an ultrafast and repeatable photoswitching performance with a cutoff frequency (f 3dB) exceeding 100 kHz. Overall, this study reveals the great potential of 2D ReX2-based vdWs heterostructures for high-performance, ultrafast, and polarization-sensitive broadband photodetectors.

2D Rhenium Dichalcogenides: From Fundamental Properties to Recent Advances in Photodetector Technology

“…During the past few years, a vast variety of heterostructure photodetectors have been reported by combining ReX 2 with other layered materials such as black phosphorus, [274,275,313,329,330] black arsenic phosphorus, [308] graphene, [331][332][333] InSe, [276,334] GeSe, [277,335] GaSe, [235] and group VI TMDs. [67,75,77,78,233,[237][238][239]278,[336][337][338][339][340][341][342][343] In addition, ReS 2 /ReSe 2 , [79,80,236,344,345] Te/ReS 2 , [269,346,347] Mxene, [348] Se/ ReS 2 , [349,350] and ReS 2 /2D Perovskite [351] The device on a h-BN substrate demonstrated enhanced photocurrent and hence high photoresponsivity due to low Schottky barrier height. Reproduced with permission.…”

“…Some of the heterostructures discussed above (WS 2 /ReS 2 , ReS 2 /ReSe 2 , BP/ReS 2 , GeSe/ReSe 2 , GaSe/ReS 2 , InSe/ReSe 2 , ReS 2 /MoTe 2 , MoS 2 /ReSe 2 , WSe 2 /ReSe 2 , and ReS 2 /graphene/ WSe 2 ) have been utilized in the design of polarization sensitive photodetectors. [68,[235][236][237][238][239]277,313,334,339,365] The polarization sensitivity of the photodetector can be assessed from the polarization ratio or anisotropic ratio. Combining two anisotropic materials in a heterostructure can offer photodetectors with exceptional merits.…”

“…[236] Due to staggered alignment of the heterostructure and associated change in anisotropic light absorption property of the heterostructure, the dichroic ratio can be varied from 1.2 (at 638 nm) to 2 (at 980 nm). [236] When fabricating a photodetector using two anisotropic materials, it is essential that the maximum polarization direction of the layers must align parallel to each other. Otherwise, the linear polarization sensitivity would be deteriorated.…”

“…Copyright 2021, Elsevier Ltd. Panel B shows ambipolar photoresponse from an ReSe 2 /ReS 2 photodetector with ultrafast photoresponse and cut-off frequency exceeding 100 KHz. Reproduced with permission [236]. Copyright 2022, American Chemical Society.…”

Enhanced Photodetection Range from Visible to Shortwave Infrared Light by ReSe2/MoTe2 van der Waals Heterostructure

“…(b) The photocurrent as functions of light intensity under 2000 nm incident light; Figure S8: Responsivity and specific detectivity of the ReSe 2 /MoTe 2 heterojunction photodetector as functions of light intensity under different wavelengths of (a) 405 nm, (b) 532 nm, (c) 655 nm, (d) 808 nm, (e) 1550 nm, (f) 2000 nm; Table S1: Key parameter comparison list of ReSe 2 /MoTe 2 heterojunction photodetector. References [ 38 , 39 , 40 , 41 , 42 , 43 ] are cited in the Supplementary Materials .…”