Flexible VO₂ Films for In‐Sensor Computing with Ultraviolet Light

Abstract

With their unique advantages in portability, shape adaptability, and human friendly surfaces, flexible electronics pave the way for the implementation of wearable electronic textiles and human-machine interfaces. Although organic materials are promising for flexible devices because of the low-cost manufacturing and inherent flexibility, they meet challenges in harsh environments such as ultraviolet (UV) irradiation, which limits their applicability in UV sensors. Here, a flexible UV neuromorphic sensor is presented using inorganic vanadium dioxide (VO 2 ) films grown on mica substrates. The flexible device shows UV photoinduced nonvolatile phase transition, and can be reversibly modulated using electrolyte gating. The optical responses remain almost unchanged after 10 000 bending cycles or at small bending radius, exhibiting high tolerance to the bending deformation. Besides, the variations in image recognition accuracy under different bending conditions keep within 1.6%, indicating that the device can be adapted to various deformation conditions. By constructing near-/in-sensor computing architectures using the flexible VO 2 neuromorphic sensors with photoinduced nonvolatile phase transition, both static image processing and motion detection are realized without redundant and massive information transfer. This result lays the foundation for the development of flexible UV neuromorphic sensors.

Photoinduced Nonvolatile Displacive Transformation and Optical Switching in MnTe Semiconductors

“…Such a photoinduced structural transformation via atomic displacement can break the limit of the operation speed and energy in conventional PCMs, showing diffusional transformation. Furthermore, latest research has reported the applicability of nonvolatile optical switching to neuromorphic sensors. , Given these research trends, our experimental discoveries demonstrate that the MnTe polymorph can be a promising material for future application in ultrafast photonic memory and various optoelectronics devices.…”

Tetrachromatic vision-inspired neuromorphic sensors with ultraweak ultraviolet detection

“…After sensing with the device arrays, pistil signals in the memorized graphs are significantly enhanced, the petal signal is suppressed, and the surrounding signals are almost completely suppressed (Supplementary Movie 2 ). Subsequently, Supplementary Movie 2 is split into 74 frames with an interval of 20 ms, and the interframe differential computations are introduced to frame difference calculation of the memorized graphs 53 . The detailed explanation was described in Supplementary Note 2.…”

Flexible Strain Sensors Based on Direct-Writing VO2 Nanobelts Inks for Monitoring Human Motions and Human–Machine Interaction

“…The study of VO 2 -based flexible strain sensors will promote the development of the next generation of multidimensional interaction technology that provides technical support for AI technology. Furthermore, the VO 2 flexible sensors were manufactured mainly by pulsed laser deposition, 34 photolithography, 35 etc. Although these methods can produce thinner, higher purity VO 2 films, they require high processing equipment and a special atmosphere.…”