Ultra-sensitive polarization-resolved black phosphorus homojunction photodetector defined by ferroelectric domains

Shuaiqin Wu, Yan Chen, Xudong Wang (), Hanxue Jiao, Qianru Zhao, Xinning Huang, Xiaochi Tai, Yong Zhou, Hao Chen, Xingjun Wang, Shenyang Huang, Hugen Yan, Tie Lin, Hong Shen, Weida Hu, Xiangjian Meng, Junhao Chu and Jianlu Wang ()
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Shuaiqin Wu: Chinese Academy of Sciences
Yan Chen: Chinese Academy of Sciences
Xudong Wang: Chinese Academy of Sciences
Hanxue Jiao: Chinese Academy of Sciences
Qianru Zhao: Chinese Academy of Sciences
Xinning Huang: Chinese Academy of Sciences
Xiaochi Tai: Chinese Academy of Sciences
Yong Zhou: Chinese Academy of Sciences
Hao Chen: Chinese Academy of Sciences
Xingjun Wang: Chinese Academy of Sciences
Shenyang Huang: Fudan University
Hugen Yan: Fudan University
Tie Lin: Chinese Academy of Sciences
Hong Shen: Chinese Academy of Sciences
Weida Hu: Chinese Academy of Sciences
Xiangjian Meng: Chinese Academy of Sciences
Junhao Chu: Chinese Academy of Sciences
Jianlu Wang: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract With the further miniaturization and integration of multi-dimensional optical information detection devices, polarization-sensitive photodetectors based on anisotropic low-dimension materials have attractive potential applications. However, the performance of these devices is restricted by intrinsic property of materials leading to a small polarization ratio of the detectors. Here, we construct a black phosphorus (BP) homojunction photodetector defined by ferroelectric domains with ultra-sensitive polarization photoresponse. With the modulation of ferroelectric field, the BP exhibits anisotropic dispersion changes, leading an increased photothermalelectric (PTE) current in the armchair (AC) direction. Moreover, the PN junction can promote the PTE current and accelerate carrier separation. As a result, the BP photodetector demonstrates an ultrahigh polarization ratio (PR) of 288 at 1450 nm incident light, a large photoresponsivity of 1.06 A/W, and a high detectivity of 1.27 × 1011 cmHz1/2W−1 at room temperature. This work reveals the great potential of BP in future polarized light detection.

Date: 2022
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DOI: 10.1038/s41467-022-30951-y

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