An ultrathin MoSe 2 photodetector with near-perfect absorption

作者：Wen Du, Peng Yu, Juntong Zhu, Caihong Li, Hao Xu, Jihua Zou, Cuo Wu, Qiye Wen, Haining Ji, Tianji Liu, Yanbo Li, Guifu Zou, Jiang Wu, Zhiming Wang · 发表于：Nanotechnology · 年份：2020 · DOI：10.1088/1361-6528/ab746f · 被引用次数：37 · 研究领域：Metamaterials and Metasurfaces Applications、2D Materials and Applications、Quantum Dots Synthesis And Properties

Abstract An ultrathin near-perfect MoSe 2 absorber working in the visible regime is demonstrated theoretically and experimentally, and it consists of a MoSe 2 /Au bi-layer film. The polymer-assisted deposition method is used to synthesize MoSe 2 films, which can reduce the roughness and thus improve the film absorption. Simulation results show that the absorption of the absorber with 22 nm MoSe 2 reaches to larger than 90% between 628.5 nm and 718 nm with a peak value up to 99.5% at 686 nm. Moreover, the measured absorption also shows near-perfect absorption of this simple absorber. Finally, an ultrathin photodetector is fabricated based on this perfect absorber and shows on/off reproducibility and remarkable photocurrent, which is three orders of magnitude higher than the dark current.