Flexible VO2 Films for In‐Sensor Computing with Ultraviolet Light

• Published in: Advanced functional materials 2022-07, Vol.32 (29), p.n/a
• Main Authors: Li, Ge, Xie, Donggang, Zhang, Ziye, Zhou, Qingli, Zhong, Hai, Ni, Hao, Wang, Jiaou, Guo, Er‐jia, He, Meng, Wang, Can, Yang, Guozhen, Jin, Kuijuan, Ge, Chen
• Format: Article
• Language: English
• Subjects: Bend radius; Bending machines; Deformation; Flexible components; flexible devices; Image processing; Information transfer; Materials science; Mica; Motion perception; Mott materials; neuromorphic sensors; Object recognition; Organic materials; Phase transitions; photoinduced phase transitions; Sensors; Substrates; Textiles; Ultraviolet radiation; Vanadium dioxide; vanadium dioxides; Vanadium oxides
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202203074

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 (VO2) 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 VO2 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. The flexible ultraviolet (UV) neuromorphic sensor using vanadium dioxide (VO2) films grown on mica is reported. Reversible nonvolatile modulation of VO2 is achieved through photogating and electrolyte gating. The device exhibits high tolerance to bending deformation. By constructing near‐/in‐sensor computing architectures, both static image processing and motion detection are realized. This work lays the foundation for the development of flexible UV neuromorphic sensors.