Electrically Tunable Multiple-Effects Synergistic and Boosted Photoelectric Performance in Te/WSe2 Mixed-Dimensional Heterojunction Phototransistors

Hechun Cao; Tao Hu; Jiyue Zhang; Dongyang Zhao; Yan Chen; Xudong Wang; Jing Yang; Yuanyuan Zhang; Xiaodong Tang; Wei Bai; Hong Shen; Jianlu Wang; Junhao Chu

doi:10.1002/advs.202400018

Electrically Tunable Multiple-Effects Synergistic and Boosted Photoelectric Performance in Te/WSe₂ Mixed-Dimensional Heterojunction Phototransistors

Adv Sci (Weinh). 2024 Mar 19:e2400018. doi: 10.1002/advs.202400018. Online ahead of print.

Authors

Hechun Cao^{1

2}, Tao Hu^{1

2}, Jiyue Zhang¹, Dongyang Zhao^{1

2}, Yan Chen^{2

3}, Xudong Wang², Jing Yang¹, Yuanyuan Zhang¹, Xiaodong Tang^{1

4}, Wei Bai¹, Hong Shen², Jianlu Wang^{2

3

5}, Junhao Chu^{2

3}

Affiliations

¹ Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, Shanghai, 200241, P. R. China.
² State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, No.500 Yutian Road, Shanghai, 200083, P. R. China.
³ Shanghai Frontier Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Fudan University, Shanghai, 200433, P. R. China.
⁴ Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China.
⁵ Frontier Institute of Chip and System, Fudan University, Shanghai, 200433, P. R. China.

PMID: 38502873
DOI: 10.1002/advs.202400018

Abstract

Mix-dimensional heterojunctions (MDHJs) photodetectors (PDs) built from bulk and 2D materials are the research focus to develop hetero-integrated and multifunctional optoelectronic sensor systems. However, it is still an open issue for achieving multiple effects synergistic characteristics to boost sensitivity and enrich the prospect in artificial bionic systems. Herein, electrically tunable Te/WSe₂ MDHJs phototransistors are constructed, and an ultralow dark current below 0.1 pA and a large on/off rectification ratio of 10⁶ is achieved. Photoconductive, photovoltaic, and photo-thermoelectric conversions are simultaneously demonstrated by tuning the gate and bias. By these synergistic effects, responsivity and detectivity respectively reach 13.9 A W^-1 and 1.37 × 10¹² Jones with 400 times increment. The Te/WSe₂ MDHJs PDs can function as artificial bionic visual systems due to the comparable response time to those of the human visual system and the presence of transient positive and negative response signals. This work offers an available strategy for intelligent optoelectronic devices with hetero-integration and multifunctions.

Keywords: Te/WSe2 heterojunction; multiple-mechanisms effects; photodetectors.

Abstract

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