2020, High-Performance Polarization-Sensitive Photodetector based on a Few-Layered PdSe2 Nanosheet. Nano Research.

High-Performance Polarization-Sensitive Photodetector based on a Few-Layered PdSe2Nanosheet(Nano Research)

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. 

KEYWORDS: PdSe2, Anisotropy, Polarization-Sensitive, Linear Dichroism

Link: https://link.springer.com/article/10.1007/s12274-020-2804-y#citeas