Spin-Enhanced Self-Powered Light Helicity Detecting Based on Vertical WSe<sub>2</sub>-CrI<sub>3</sub> <i>p-n</i> Heterojunction.
basic_science · Level V
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- Record sourced from PubMed, PMID 39267593.
- Also identified by DOI 10.1021/acsnano.4c08185.
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Abstract
Two-dimensional (2D) magnetic semiconductors offer an intriguing platform for investigating magneto-optoelectronic properties and hold immense potential in developing prospective devices when they are combined with valley electronic materials like 2D transition-metal dichalcogenides. Herein, we report various magneto-optoelectronic response features of the vertical hBN-FLG-CrI<sub>3</sub>-WSe<sub>2</sub>-FLG-hBN van der Waals heterostructure. Through a sensible layout and exquisite manipulation, an hBN-FLG-CrI<sub>3</sub>-FLG-hBN heterostructure was also fabricated on identical CrI<sub>3</sub> and FLGs for better comparison. Our results show that the WSe<sub>2</sub>-CrI<sub>3</sub> heterostructure, acting as a <i>p</i>-<i>n</i> heterojunction, has advantageous capability in light detection, especially in self-powered light helicity detecting. In the WSe<sub>2</sub>-CrI<sub>3</sub> heterojunction, the absolute value of photocurrent <i>I</i><sub>PH</sub> exhibits obvious asymmetry with respect to the bias <i>V</i>, with the <i>I</i><sub>PH</sub> of reversely biased WSe<sub>2</sub>-CrI<sub>3</sub> <i>p-n</i> heterojunction being larger. When the CrI<sub>3</sub> is fully spin-polarized under a 3 T magnetic field, the reversely biased WSe<sub>2</sub>-CrI<sub>3</sub> heterojunction exhibits advantageous capability in light helicity detecting. Both the short-circuit currents <i>I</i><sub>SC</sub> and <i>I</i><sub>PH</sub> show one-cycle fluctuation behaviors when the quarter-wave plate rotates 180°, and the corresponding photoresponsivity helicities can be as high as 18.0% and 20.1%, respectively. We attribute the spin-enhanced photovoltaic effect in the WSe<sub>2</sub>-CrI<sub>3</sub> heterojunction and its contribution to circularly polarized light detection to the coordination function of the spin-filter CrI<sub>3</sub>, the valley electronic monolayer WSe<sub>2</sub>, and the spin-dependent charge transfer between them. Our work helps us understand the interplay between the magnetic and optoelectronic properties of WSe<sub>2</sub>-CrI<sub>3</sub> heterojunctions and promotes the developing progress of prospective 2D spin optoelectronic devices.