Highly Sensitive and Flexible B‐VO2/Polymer Photodetector for Broadband Infrared Detection

Abstract Thermal‐type uncooled infrared detectors, or the so‐called micro‐bolometers, typically based on VO x compound, have been developed and commercialized for many years. The unsatisfied temperature coefficient of resistance (TCR) of VO x and the lack of mechanical flexibility seriously limits the device sensitivity and application scenarios. Here, a flexible free‐standing B‐VO 2 /polymer film with enhanced TCR value and high absorptivity is prepared, and then a broadband infrared detector with detectivity up to 2.11 × 10 8 Jones has been fabricated, covering the wavelength from visible to mid‐infrared region. In addition, the obtained device shows stable infrared detection performance during the bending tests, demonstrating excellent flexibility. The current studies not only provide a facile route to prepare the B‐VO 2 ‐based infrared‐sensitive film with high TCR values, but also achieve flexible infrared detector fabrication, which should be promising for wearable sensors and integrated infrared imaging systems in the future.