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

Nano Research - Tập 13 - Trang 1780-1786 - 2020
Jiahong Zhong1, Juan Yu1,2, Lingkai Cao1, Cheng Zeng1, Junnan Ding1, Chunxiao Cong3, Zongwen Liu4, Yanping Liu1,5,6
1School of Physics and Electronics, Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, Central South University, Changsha, China
2School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, China
3School of Information Science and Technology, Fudan University, Shanghai, China
4School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, Australia
5Shenzhen Research Institute of Central South University, Shenzhen, China
6State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, China

Tóm tắt

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 (/max//min ≈ 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.

Tài liệu tham khảo

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Nano Research

Tập 13

1780-1786

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