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Highly In‐Plane Anisotropic 2D PdSe 2 for Polarized Photodetection with Orientation Selectivity
Author(s) -
Pi Lejing,
Hu Chunguang,
Shen Wanfu,
Li Liang,
Luo Peng,
Hu Xiaozong,
Chen Ping,
Li Dongyan,
Li Zexin,
Zhou Xing,
Zhai Tianyou
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202006774
Subject(s) - photodetection , materials science , anisotropy , linear dichroism , polarization (electrochemistry) , optics , dichroism , linear polarization , optoelectronics , photodetector , circular dichroism , physics , crystallography , chemistry , laser
Polarized photodetection based on anisotropic two‐dimensional materials display promising prospects for practical application in optical communication and optoelectronic fields. However, most of the reported polarized photodetection are limited by the lack of valid tunable strategy and low linear dichroism ratio. A peculiar noble metal dichalcogenide—PdSe 2 with a puckered pentagonal structure and abnormal linear dichroism conversion—potentially removes these restrictions and is demonstrated in this study. Herein, azimuth‐dependent reflectance difference microscopy combined with anisotropic electrical transport measurements indicate strong in‐plane anisotropic optical and electrical properties of two‐dimensional PdSe 2 . Remarkably, the typical polarization‐resolved photodetection exhibits anisotropic photodetection characteristics with a dichroic ratio up to ≈1.8 at 532 nm and ≈2.2 at 369 nm, and their dominant polarization orientation differs by 90° corresponding to the a ‐axis and b ‐axis, respectively. The unique orientation selection behavior in polarization‐dependent photodetection can be attributed to the intrinsic linear dichroism conversion. The results make 2D PdSe 2 a promising platform for investigating anisotropic structure–property correlations and integrated optical applications for novel polarization‐sensitive photodetection.