High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet
PdSe2, anisotropy, polarization-sensitive, linear dichroism
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.
Tsinghua University Press
Jiahong Zhong,Juan Yu,Lingkai Cao,Cheng Zeng,Junnan Ding,Chunxiao Cong,Zongwen Liu,Yanping Liu, High-performance polarization-sensitive photodetector based on a few-layered PdSe2 nanosheet. NanoRes.2020, 13(6): 1780–1786