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SbSI whisker/PbI2 flake mixed-dimensional van der Waals heterostructure for photodetection

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Abstract

Here we report for the first time a van der Waals (vdW) heterostructure formed from an individual single crystal SbSI whisker and individual PbI2 flake for photodetection. Benefiting from the millimeter-sized whisker and flake, we take advantage of the flexibility of operation and vdW junction interface between SbSI and PbI2. This mixed-dimensional heterostructure is used as an optoelectronics platform due to the larger light-harvesting cross section than the individual material. It generates photocurrent to broaden the spectral response range. The two-dimensional (2D) material acts as a current collector, while the single crystal whisker material acts as a current channel. Compared with the individual SbSI device, the vdW heterojunction device can achieve a lower dark current. As a result, our SbSI–PbI2 photodetector exhibits a responsivity of up to 26.3 mA W−1 and shows a fast response speed of ∼12 ms. Large-area growth and scalable approaches lead to an efficient transfer strategy and heterostructure assembly. These investigations will broaden our fundamental knowledge of vdW heterostructures. This mixed-dimensional vdW heterostructure opens new opportunities for basic research of micro/nano-optoelectronics.

Graphical abstract: SbSI whisker/PbI2 flake mixed-dimensional van der Waals heterostructure for photodetection

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Publication details

The article was received on 11 Apr 2019, accepted on 12 May 2019 and first published on 14 May 2019


Article type: Paper
DOI: 10.1039/C9CE00544G
CrystEngComm, 2019, Advance Article

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    SbSI whisker/PbI2 flake mixed-dimensional van der Waals heterostructure for photodetection

    L. Sun, C. Wang, L. Xu, J. Wang, X. Liu, X. Chen and G. Yi, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE00544G

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