A Flexible Solar-blind Ultraviolet Photodetector Based on Carbon Dots

With the update and iteration of intelligent devices, there are more demands for flexible and foldable functions of devices. Therefore, flexible materials as substrates are a promising research direction for solar-blind ultraviolet (UV) photodetectors (PDs). At the same time, carbon dots (CDs) are also widely concerned due to their excellent optical performance. In this work, a flexible solar-blind UV PD based on CDs is fabricated on a low-cost using polydimethylsiloxane (PDMS) and polyethylene terephthalate (PET) as substrates, respectively. Under the same fabrication and bending test conditions, the device based on PET substrate shows better performance, that is, it has more stable operating current and lower loss caused by bending. The device based on PET exhibits extraordinary detectivity of 1.76×10
¹¹
Jones without bending and 1.68×10
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Jones at the bending strain of 0.2% at 10V. The results show that flexible solar-blind UV PDs are of great significance for the realization of wearable functions.