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

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.