Presentation Information
[11a-B12-5]Demonstration of Long-Term Stable Operation of Organic Single-Crystal Vibration Sensors Using a Thin Hollow Encapsulation Structure
〇(M1C)Yugo Taki1, Tatsuyuki Makita2, Junto Tsurumi2, Kei Kubotera1, Yu Yamashita1,3, Ryouhei Kameyama1, Jun Takeya1,2,3 (1.The Univ of Tokyo, 2.PI-CRYSTAL INC., 3.NIMS)
Keywords:
Organic single-crystal semiconducto,Vibration sensor,Hollow encapsulation
Organic single-crystal semiconductors show a large conductive response to mechanical deformation, making them promising for vibration sensors that can be attached to pipes and rotating machinery to detect abnormal vibrations for equipment condition monitoring. However, organic devices degrade under oxygen and moisture, and because vibration sensors need a displacement space, simply laminating an encapsulation layer can suppress the mechanical response.In this study, we demonstrated long-term stable operation of an organic single-crystal vibration sensor under high-temperature, high-humidity conditions. We applied a thin hollow encapsulation structure consisting of an ABS resin frame that preserves the displacement space and a barrier film. The frequency response changed within 13.6% near 500 Hz after encapsulation, confirming that sensor operation is not impaired. In an accelerated aging test at 60 °C and 90% RH, the encapsulated device kept the resistance increase ratio below 15% after 1000 h, demonstrating practically sufficient long-term stability.