Tunable WSe2 -CdS mixed-dimensional van der Waals heterojunction with a piezo-phototronic effect for an enhanced flexible photodetector

Nanoscale
Pei LinZhong Lin Wang

Abstract

Due to the absence of bond fracture and atomic reconstruction under strain, vdWs structures hold great promise in flexible electronic/optoelectronic applications. Besides all-2D heterojunctions, the dangling-bond-free surfaces of 2D materials also enable vdWs interaction with other materials of different dimensionalities, forming mixed-dimensional vdWs heterostructures. Such structures allow a much broader selection of materials and may provide a promising approach to compensate for the intrinsic weakness of 2D crystals before realizing their full potential. In this study, we present the fabrication of a WSe2-CdS mixed-dimensional vdWs p-n heterojunction for flexible photodetection. A strain-tunable vdWs interface was demonstrated and the photoresponse was dramatically enhanced with the piezo-phototronic effect. The photocurrent can be increased by ∼110% under a compressive strain of -0.73% and the corresponding photoresponsivity reaches up to 33.4 A W-1. The enhancement originates from realigned local energy-band tilting at the WSe2-CdS interface by strain-induced piezopolarization, which promotes the transport process of photoexcited carriers. Our work provides a new route to a tunable vdWs interface other than with electrost...Continue Reading

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Citations

Jan 28, 2020·Nanoscale·Mohammad B GhasemianKourosh Kalantar-Zadeh
Mar 3, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Huiming ShangPingAn Hu
Mar 7, 2019·ACS Nano·Chunhua AnJing Liu
Sep 4, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Pei-Yu HuangCheng-Yan Xu

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Methods Mentioned

BETA
optical microscopy
atomic force microscopy
transmission electron microscopy
AFM
electron diffraction
electron beam lithography

Software Mentioned

Metatest

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