Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 57, Issue 5, Pages 995-1002Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2010.2044278
Keywords
Large-area sensor; organic transistor; polyvinylidene fluoride (PVDF); ultrasonic wave
Funding
- MEXT
- NEDO
- JST
- Special Coordination Funds for Promoting Science and Technology
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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 x 25 cm(2). The organic transistors exhibit mobility of 0.1 and 0.5 cm(2)/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 10(4) 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 10(4). Images in free space are obtained for multiple-target objects over this sheet.
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