混合维度WS2/WSe2/Si单极势垒异质结构用于高性能光电探测
Science China Materials(2023)
摘要
The use of unipolar barrier structures that can selectively block dark current but allow photocurrent to flow unimpededly has emerged as an effective strategy for constructing high-performance photodetectors. In particular, two-dimensional (2D) materials with tunable band structures and self-passivated surfaces not only satisfy band-matching requirements but also avoid interface defects and lattice mismatches, which are attractive for designing unipolar barriers. Here, we demonstrate a mixed-dimensional WS2/WSe2/p-Si unipolar barrier photodetector, in which 2D WS2 acts as the photon absorber, atomically thin WSe2 as the unipolar barrier, and 3D p-Si as the photogenerated carrier collector. The intercalated WSe2 not only mitigates detrimental substrate effects but also forms a high-conduction band barrier to filter out several dark current components with the photocurrent flowing unimpededly. Driven by tunneling and carrier multiplication effects, the WS2/WSe2/p-Si device exhibits a high light on/off ratio above 105, a high detectivity of 2.39 × 1012 Jones, and a fast rise/decay time of 8.47/7.98 ms. These figures of merit are significantly improved over the conventional WS2/p-Si device, opening up an effective scheme for designing high-performance optoelectronic devices.
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