Enhanced Photoresponsivity of 2H-MoTe<sub>2</sub> by Inserting 1T-MoTe<sub>2</sub> Interlayer Contact for Photodetector Applications

oleh: Der-Yuh Lin, Hung-Pin Hsu, Guang-Hsin Liu, Ting-Zhong Dai, Yu-Tai Shih

Format: Article
Diterbitkan: MDPI AG 2021-08-01

Deskripsi

The 2H molybdenum telluride (MoTe<sub>2</sub>) photodetector structures were made with inserting 1T-MoTe<sub>2</sub> interlayer contacts. The optical response properties such as photoconductivity (PC) spectroscopy, illumination intensity dependent photoresponsivity, frequency dependent photocurrent, and time-resolved photoresponse were carried out in this study. In PC spectra, a much higher photoresponsivity of 2H-MoTe<sub>2</sub> were observed by inserting 1T-MoTe<sub>2</sub> interlayer contact. The frequency dependent photocurrent and time-resolved photoresponse investigations explore the carrier kinetic decay process of MoTe<sub>2</sub> with different electrode contact. The Schottky barrier heights (SBH) extracted by thermionic emission theory were also investigated by inserting 1T-MoTe<sub>2</sub> interlayer contacts. The results show the potential applicability for photodetection devices based MoTe<sub>2</sub> layered transition metal dichalcogenides semiconductors.