Anti-ambipolar and polarization-resolved behavior in MoTe2 channel sensitized with low-symmetric CrOCl

Abstract

Atomically thin two-dimensional (2D) materials make it possible to create a variety of van der Waals (vdW) heterostructures with different physical features and attributes, which enables the growth of innovative electronics and optoelectronics applications. The band alignment and charge transfer play a crucial role in the physical and optoelectrical properties of the vdW heterostructure. Here, we design a vdW heterojunction device comprising low-symmetric CrOCl to induce a stable anti-ambipolar behavior and polarization-sensitive photodetection performance. 2D CrOCl exhibits strong in-plane anisotropy and linear dichroism, and an anti-ambipolar transport behavior is observed in a MoTe2 channel due to the gate-tunable band bending and charge transfer at MoTe2/CrOCl interface. The devices also exhibit well photodetection performance with a responsivity of 1.05 A/W and a temporal response of 970 μs. Owing to the anisotropic CrOCl serving as a photosensitizing layer, the device achieves the capability of polarization-sensitive photodetection with a photocurrent dichroic ratio up to ∼6. This work offers a valid device model and design strategy to realize the versatile optoelectronics, including the anti-ambipolar transistor and polarimetric photodetectors.

1D Sb2S3 with Strong Mie Resonance Toward Highly‐Sensitive Polarization‐Discriminating Photodetection and Its Application in High‐Temperature‐Proof Imaging and Dual‐Channel Communications

“…As shown in Figure 3k,l, the response/recovery time is extracted to be ≈10/12 ms, which is comparable to the state-of-the-art low-dimensional vdW material photodetectors. [55][56][57] For an intuitive comparison, Tables S1 and S2 (Supporting Information) have summarized the key performance metrics of photodetectors based on 1D and 2D vdW materials, respectively. Overall, our device stands out in consideration of the comprehensive device properties.…”

Anti‐Ambipolar Heterojunctions: Materials, Devices, and Circuits

“…[75] d) Schematic diagram and e) Λ-shaped transfer curves of the CrOCl/2H-MoTe 2 heterojunction AATs under light illumination. [79] Inset of e) shows the band structure of heterojunction under light illumination. f) Polar plots of polarization-resolved photocurrent.…”

“…[81,176,177] Most recently, an AAT based on CrOCl/2H-MoTe 2 heterojunction was designed to show polarization-sensitive photodetection (Figure 13d). [79] Here, the primary operating mechanism for the anti-ambipolar and polarization-sensitive photoresponse is based on the gate-tunable band bending and charge transfer at the CrOCl/2H-MoTe 2 interface. (Figure 13e).…”

“…[178] The CrOCl/2H-MoTe 2 heterojunction also shows good photodetection performance with a photocurrent dichroic ratio of ≈6 (Figure 13f), a responsivity of 1.05 A/W, and a photoresponse time of 970 μs. [79] Also, based on two strong anisotropic 2D materials, anti-ambipolar heterojunctions made by p-BP and n-ReS 2 show a more substantial linear polarized photocurrent ratio of 31. [126] It is promising that combining AATs with polarizationsensitive photodetection could enrich the optoelectronic device functionalities.…”

“…a) Device illustration, b) I-V,and c) I-T characteristic curves of the photovoltaic MoTe 2 /MoS 2 heterojunction devices [75]. d) Schematic diagram and e) Λ-shaped transfer curves of the CrOCl/2H-MoTe 2 heterojunction AATs under light illumination [79]. Inset of e) shows the band structure of heterojunction under light illumination.…”