Hybrid van der Waals SnO/MoS₂ Heterojunctions for Thermal and Optical Sensing Applications

Emerging van der Waals heterojunctions (vdWH) containing 2D materials have shown exciting functionalities that surpass those of traditional devices based on bulk materials. In this Communication, a report on the properties of a 2D sulfide/oxide hybrid vdWH based on n‐type molybdenum disulfide (MoS₂) and p‐type tin monoxide (SnO) is presented, with promising rectification, thermal‐sensing, and photosensing performance. Specifically, the hybrid SnO/MoS₂ vdWH shows static rectification ratio of 2 × 10² with ideality factor of 2.3, and can operate at 100 Hz with good stability. The vdWH shows good temperature stability with reversible and reproducible current levels up to 110 °C, indicating its potential for thermal sensing applications. The sensitivity of current variation is calculated to be 0.0144 dec °C⁻¹. Finally, maximum responsivity of 8.17 mA W⁻¹ and external quantum efficiency of 2.14% have been achieved in photovoltaic measurements. The results suggest that MoS₂–SnO hybrid vdWH are promising for various sensing applications.