Photovoltaic Field-Effect Photodiodes Based on Double van der Waals Heterojunctions.
basic_science · Level V
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- Record sourced from PubMed, PMID 34435493.
- Also identified by DOI 10.1021/acsnano.1c02830.
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Abstract
High performance photodetectors based on van der Waals heterostructures (vdWHs) are crucial to developing micro-nano-optoelectronic devices. However, reports show that it is difficult to balance fast response and high sensitivity. In this work, we design a photovoltaic field-effect photodiode (PVFED) based on the WSe<sub>2</sub>/MoS<sub>2</sub>/WSe<sub>2</sub> double vdWHs, where the photovoltage that originated from one vdWH modulates the optoelectronic characteristics of another vdWH. The proposed photodiode exhibits an excellent self-powered ability with a high responsivity of 715 mA·W<sup>-1</sup> and fast response time of 45 μs. This work demonstrates an efficient method that optimizes the photoelectric performance of vdWH by introducing the photovoltaic field effect.