journal article·2024-04-30Open access

Gate-Tunable Multiband van der Waals Photodetector and Polarization Sensor

Daozhi Shen, HeeBong Yang, Tarun Patel, Daniel A. Rhodes, Thomas Timusk, Y. Norman Zhou, Na Young Kim, Adam W. Tsen

ACS Nano· Volume 18· Issue 17

Abstract

A single photodetector with tunable detection wavelengths and polarization sensitivity can potentially be harnessed for diverse optical applications ranging from imaging and sensing to telecommunications. Such a device will require the combination of multiple material systems with different structures, band gaps, and photoelectrical responses, which is extremely difficult to engineer using traditional epitaxial films. Here, we develop a multifunctional and high-performance photosensor using all van der Waals materials. The device features a gate-tunable spectral response that is switchable between near-infrared/visible and short-/midwave infrared, as well as broad-band operation, at room temperature. The linear polarization sensitivity in the telecommunication O-band can also be directly modulated between horizontal, vertical, and nonpolarizing modes. These effects originate from the balance of photocurrent generation in two of the active layers that can be manipulated by an electric field. The photodetector features high detectivity (>10 9 cmHz 1/2 W –1 ) together with fast operation speed (∼1 MHz) and can be further exploited for dual visible and infrared imaging.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Gas Sensing Nanomaterials and Sensors

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Institute for Quantum Computing, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States

Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada

Centre for Advanced Materials Joining and Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada

Funding

Shanghai Jiao Tong University · Wisconsin Alumni Research Foundation · Army Research Office · Canada Research Chairs · Industry Canada · Science and Technology Commission of Shanghai Municipality · Canada First Research Excellence Fund · Natural Sciences and Engineering Research Council of Canada · National Natural Science Foundation of China · University of Wisconsin-Madison · Ontario Ministry of Research, Innovation and Science

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