High-performance flexible photodetectors based on CdTe/MoS2 heterojunction.

Abstract

Flexible photodetectors have attracted escalating attention due to their pivotal role in next-generation wearable optoelectronic devices. This work presents high-performance photodetector devices based on CdTe/MoS₂ heterojunctions, showcasing outstanding photodetecting and distinctive mechanical properties. The MoS₂ film was exfoliated from bulk layered MoS₂ and covered by a sputtered ultrathin CdTe film (∼8.4 nm) to form a heterojunction. Benefitting from the photovoltaic effect induced by the built-in electrical field near the high-quality interface, the fabricated CdTe/MoS₂ heterojunction photodetector can operate as a self-powered photodetector without any external bias voltage, especially showing a high photodetectivity of 5.84 × 10¹¹ Jones, remarkable photoresponsivity of 270.3 mA W^-1, fast photoresponse with a rise/fall time of ∼44.8/134.2 μs and excellent bending durability. These results demonstrate that the CdTe/MoS₂ heterojunctions could have significant potential for future applications in optoelectronic devices.