2021, Direct Observation of Enhanced Performance in suspended ReS2 Photodetectors.Optics Express.

Direct Observation of Enhanced Performance in suspended ReS₂ Photodetectors.Optics Express.2021(Vol. 29, Issue 3, pp. 3567-3574 (2021) )

Abstract:

Rhenium disulfide (ReS₂) has emerged as a promising material for future optoelectric applications due to its extraordinary electrical, mechanical, and optoelectrical properties. However, the ReS₂-based photodetectors are severely restricted by their slow response speed (>10 s). Here, we demonstrate a high-performance polarization-sensitive photodetector based on suspended ReS₂. Such a transistor shows an n-type behavior with the mobility of about 14.2 cm²V⁻¹s⁻¹, an on/off ratio of 10⁵, and a responsivity of 0.22 A/W. Benefitting from well-developed contact between Au and the ReS₂ channel and reduced interface scattering from the Si substrate, the response time of the device can be as short as 83.5/325.3μs, which is three orders of magnitude faster than that reported earlier. Furthermore, the suspended ReS₂ photodetector also has the capability to detect polarized light (I_max/I_min ≈ 1.4 at 532 nm) due to the robust in-plane anisotropy of the material. These findings offer an efficient approach for improving the performance of ReS₂-based photodetectors.

Keywords: Rhenium disulfide (ReS2), suspended Photodetectors, in-plane anisotropy , polarized ligh

Link:https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-29-3-3567&id=446812