Journal
NANO RESEARCH
Volume 13, Issue 6, Pages 1780-1786Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-2804-y
Keywords
PdSe2; anisotropy; polarization-sensitive; linear dichroism
Categories
Funding
- National Natural Science Foundation of China [61775241]
- Youth Innovation Team of CSU [2019012]
- Hunan province key research and development project [2019GK2233]
- Science and Technology Innovation Basic Research Project of Shenzhen [JCYJ20180307151237242]
- Project of State Key Laboratory of High-Performance Complex Manufacturing, Central South University [ZZYJKT2020-12]
- Australian Research Council (ARC) [DP180102976]
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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 (> 10(2)), the quite fast response time (< 11 ms) and robust linearly dichroic ratios (/(max)//(min) approximate to 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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