@article{Zhong2020, 
author = {Jiahong Zhong and Juan Yu and Lingkai Cao and Cheng Zeng and Junnan Ding and Chunxiao Cong and Zongwen Liu and Yanping Liu},
title = {High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet},
year = {2020},
journal = {Nano Research},
volume = {13},
number = {6},
pages = {1780-1786},
keywords = {anisotropy, PdSe2, linear dichroism, polarization-sensitive},
url = {https://www.sciopen.com/article/10.1007/s12274-020-2804-y},
doi = {10.1007/s12274-020-2804-y},
abstract = {The extraordinary optical and electronic properties of anisotropic two-dimensional materials, such as black phosphorus, ReS2, and GeSe, enable them a promising component of polarization-sensitive photodetectors. However, these applications are significantly limited by the challenges of air-stability, response time, and linearly dichroic ratio. Interestingly, palladium diselenide (PdSe2) with high air stability is an emerging material that has robust in-plane anisotropy induced by its asymmetric pentagonal lattice structure. We have successfully prepared a few-layer PdSe2 using micromechanical exfoliation, and here we demonstrate the strong linear dichroism behavior of PdSe2 by polarization-resolved absorption spectra measurements. Such unique linear dichroism, endows the PdSe2 photodetector powerful ability to detect polarized light. The photodetector based on 5L PdSe2, as tested with polarization-dependent photocurrent mapping, exhibited competitive capability to detect polarized light, achieving a significant photocurrent on/off ratio (> 102), the quite fast response time (< 11 ms) and robust linearly dichroic ratios (Imax/Imin ≈ 1.9 at 532 nm). These results are essential advance in the development of polarization-sensitive photodetector, a crucial step towards opening up a new avenue for the application of 2D optoelectronic devices.}
}