Enhancement of Photocurrent Stability in Oxidation-Resistant WSe1.95Te0.05 Nanosheets

Shiu-Ming Huang; Ankush Saxena; Pin-Cing Wang; Tzu-Yueh Tu; Ruei-San Chen; Mitch M C Chou

doi:10.1021/acsomega.5c02983

Enhancement of Photocurrent Stability in Oxidation-Resistant WSe_1.95Te_0.05 Nanosheets

ACS Omega. 2025 Jun 13;10(24):26079-26089. doi: 10.1021/acsomega.5c02983. eCollection 2025 Jun 24.

Authors

Shiu-Ming Huang¹, Ankush Saxena^{1

2}, Pin-Cing Wang¹, Tzu-Yueh Tu¹, Ruei-San Chen³, Mitch M C Chou²

Affiliations

¹ Department of Physics, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (R.O.C.).
² Program on Key Materials, Academy of Innovative Semiconductor and Sustainable Manufacturing, National Cheng-Kung University, Tainan 70101, Taiwan (R.O.C.).
³ Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (R.O.C.).

Abstract

The electrical and optical characteristics of semimetallic WSe_1.95Te_0.05 nanosheets have been comprehensively studied. The current-voltage measurements reveal a linear response when they are interfaced with platinum (Pt) electrodes, confirming the establishment of an ohmic contact between the WSe_1.95Te_0.05 nanosheets and the Pt contacts. Additionally, the observed photocurrent demonstrates a direct linear correlation with the applied voltage and scales proportionally with the intensity of the incident light. Remarkably, the device achieves an exceptional photoresponsivity of 108 A/W at 0.5 V without requiring surface modifications. Furthermore, the electrical resistivity and photocurrent exhibit admirable stability, remaining unaffected by air exposure under ambient conditions for more than six months. These results underscore the inherent capabilities of WSe_1.95Te_0.05 nanosheets and their potential as highly reliable materials for advanced photodetection applications.