Fawzy, MiretteReza Mohammadzadeh, MohammadAbnavi, AminDe Silva, ThushaniAhmadi, RibwarGhanbari, HamidrezaKabir, FahmidKavanagh, Karen L.Hasani, AmirhosseinAdachi, Michael M.2025-02-052024-09Fawzy, Mirette, Mohammad Reza Mohammadzadeh, Amin Abnavi, Thushani De Silva, Ribwar Ahmadi, Hamidreza Ghanbari, Fahmid Kabir, Karen L. Kavanagh, Amirhossein Hasani, and Michael M. Adachi. "A Photovoltaic Self-Powered Volatile Organic Compounds Sensor Based on Asymmetric Geometry 2D MoS2 Diodes." ECS Sensors Plus 3, no. 4 (2024): 043601.2754-2726https://scholarworks.montana.edu/handle/1/19154Transition metal dichalcogenides have gained considerable interest for vapour sensing applications due to their large surface-to-volume ratio and high sensitivity. Herein, we demonstrate a new self-powered volatile organic compounds (VOC) sensor based on asymmetric geometry multi-layer molybdenum disulfide (MoS2) diode. The asymmetric contact geometry of the MoS2 diode induces an internal built-in electric field resulting in self-powering via a photovoltaic response. While illuminated by UV-light, the sensor exhibited a high responsivity of ∼60% with a relatively fast response time of ∼10 sec to 200 ppm of acetone, without an external bias voltage. The MoS2 VOC diode sensor is a promising candidate for self-powered, fast, portable, and highly sensitive VOC sensor applications.en-UScc-byhttps://creativecommons.org/licenses/by/4.0/volatile organic compounds (VOCs)asymmetric geometrysurface to volume ratiophotovoltaic sensorArticle10.1149/2754-2726/ad7c61