Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates
Main positions:1. Instructor of the "Talent Program" of the Chinese Ministry of Education and the China Association for Science and Technology2. Specially appointed expert of Hunan Overseas Chinese Federation3. "Optics" ， editorial board4. Member of American Physical Society, American Society of Electrical and Electronics Engineers, American Chemical Society, Royal Society of Chemistry.
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Impact Factor:8.5
DOI number:10.1007/s12274-020-2804-y
Journal:Nano Research
Key Words:PdSe2, Anisotropy, Polarization-Sensitive, Linear Dichroism
Abstract:The extraordinary optical and electronic properties of anisotropic two-dimensional (2D) materials, such as black phosphorus (BP), 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, respectively. 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. Here, we successfully prepared a few-layer PdSe2 using micromechanical exfoliation and demonstrated strong linear dichroism behavior of PdSe2 by polarization-resolved absorption spectra measurements. Such unique linear dichroism, endow PdSe2 photodetector powerful ability to detect polarized light. Photodetector based on 5L PdSe2, tested with polarization-dependent photocurrent mapping, exhibited competitive capability to detect polarized light, including a significant photocurrent on/off ratio (>102), the quite fast response time (<11ms) and robust linearly dichroic ratios (Imax/Imin ≈ 1.9 at 532nm). Our study is an 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.
Indexed by:Journal paper
Discipline:物理学
Document Type:J
Volume:13
Page Number:1780–1786
Translation or Not:no
Date of Publication:2020-04-10
Included Journals:SCI
Links to published journals:https://link.springer.com/article/10.1007/s12274-020-2804-y#citeas
