Near-Infrared Self-Powered Linearly Polarized Photodetection and Digital Incoherent Holography Using WSe<sub>2</sub>/ReSe<sub>2</sub> van der Waals Heterostructure.
basic_science · Level V
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- Record sourced from PubMed, PMID 34677045.
- Also identified by DOI 10.1021/acsnano.1c06234.
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Abstract
Polarization-sensitive photodetection has attracted considerable attention as an emerging technology for future optoelectronic applications such as three-dimensional (3D) imaging, quantum optics, and encryption. However, traditional photodetectors based on Si or III-V InGaAs semiconductors cannot directly detect polarized light without additional optical components. Herein, we demonstrate a self-powered linear-polarization-sensitive near-infrared (NIR) photodetector using a two-dimensional WSe<sub>2</sub>/ReSe<sub>2</sub> van der Waals heterostructure. The WSe<sub>2</sub>/ReSe<sub>2</sub> heterojunction photodiode with semivertical geometry exhibits excellent performance: an ideality factor of 1.67, a broad spectral photoresponse of 405-980 nm with a significant photovoltaic effect, outstanding linearity with a linear dynamic range wider than 100 dB, and rapid photoswitching behavior with a cutoff frequency up to 100 kHz. Strongly polarized excitonic transitions around the band edge in ReSe<sub>2</sub> lead to significant 980 nm NIR linear-polarization-dependent photocurrent. This linear polarization sensitivity remains stable even after exposure to air for longer than five months. Furthermore, by leveraging the NIR (980 nm)-selective linear polarization detection of this photodiode under photovoltaic operation, we demonstrate digital incoherent holographic 3D imaging.