A parylene/graphene UV photodetector with ultrahigh responsivity and long term stability

Liting Huang; Zhaowei Zhu; Chuantong Cheng; Yang Gao

doi:10.1088/1361-6528/ad4b25

A parylene/graphene UV photodetector with ultrahigh responsivity and long term stability

Nanotechnology. 2024 May 14. doi: 10.1088/1361-6528/ad4b25. Online ahead of print.

Authors

Liting Huang¹, Zhaowei Zhu¹, Chuantong Cheng², Yang Gao¹

Affiliations

¹ China Agricultural University, No. 17, Tsinghua East Road, Haidian District, Beijing, Beijing, 100083, CHINA.
² Key Laboratory of Optoelectronic Materials and Devices, Chinese Academy of Sciences, No.A35, QingHua East Road, Haidian District, Beijing, Beijing, 100864, CHINA.

PMID: 38744249
DOI: 10.1088/1361-6528/ad4b25

Abstract

Long term stability, high responsivity, and fast response speed are essential for the commercialization of graphene photodetectors (GPDs). In this work, a parylene/graphene UV photodetector with long term stability, ultrahigh responsivity and fast response speed, is demonstrated. Parylene as a stable physical and chemical insulating layer reduces the environmental sensitivity of graphene, and enhances the performances of GPDs. In addition, utilizing bilayer electrodes reduces the buckling and damage of graphene after transferring. Parylene/graphene UV photodetector exhibits an ultrahigh responsivity of 5.82×10^5 A/W under 325 nm light irradiation at 1 V bias. Additionally, it shows a fast response speed of 17 μs, and a long term stability at 405 nm wavelength which is absent in the device without parylene. Parylene/graphene UV photodetector possesses superior performances. This paves the way to realize the commercial application of high-performance graphene hybrid photodetectors, and provides a practical method for maintaining the long term stability of two dimensional (2D) materials.&#xD.

Keywords: Graphene; Parylene; Photodetectors; Responsivity; UV; Ultrahigh.