Research Article


2020, 13(6): 1780–1786


High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet

Jiahong Zhong1, Juan Yu1,2, Lingkai Cao1, Cheng Zeng1, Junnan Ding1, Chunxiao Cong3, Zongwen Liu4, and Yanping Liu1,5,6 (*)

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1 School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, China
2 School of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
3 School of Information Science and Technology, Fudan University, Shanghai 200433, China
4 School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
5 Shenzhen Research Institute of Central South University, Shenzhen 518057, China
6 State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China

Keywords: PdSe2, anisotropy, polarization-sensitive, linear dichroism
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  • Abstract
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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.
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High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet. Nano Res. 2020, 13(6): 1780–1786

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