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Large-Area Flexible Ultrasonic Imaging System With an Organic Transistor Active Matrix

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7 Author(s)
Kato, Y. ; Quantum-Phase Electron. Center, Univ. of Tokyo, Tokyo, Japan ; Sekitani, T. ; Noguchi, Y. ; Yokota, T.
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We have successfully fabricated a large-area flexible ultrasonic imaging system by integrating a polymeric ultrasonic-transducer array sheet with an active matrix of organic field-effect transistors. The ultrasonic sheet comprises 8 x 8 ultrasonic sensing cells with an effective size of 25 × 25 cm2. The organic transistors exhibit mobility of 0.1 and 0.5 cm2/V ·s at the low operation voltage of 1 mV and in the saturation regime, respectively. When an ac signal is applied between source and drain electrodes for the transistors with a grounded gate, the on/off ratio is larger than 104 at the carrier frequency of 40 kHz. In the linear sensing array comprising eight ultrasonic cells, crosstalk is suppressed sufficiently low, and the on/off ratio exceeds 104. Images in free space are obtained for multiple-target objects over this sheet.

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Electron Devices, IEEE Transactions on  (Volume:57 ,  Issue: 5 )