Affiliation:
1. The Institute of Scientific and Industrial Research (SANKEN) Osaka University Ibaraki Osaka 567‐0047 Japan
2. JOANNEUM RESEARCH Forschungsgesellschaft mbH MATERIALS – Institute for Sensors Photonics and Manufacturing Technologies Franz‐Pichler Straße 30 Weiz 8160 Austria
3. Advanced Photonics and Biosensing Open Innovation Laboratory AIST‐Osaka University Suita Osaka 565‐0871 Japan
Abstract
AbstractFlexible sensors are currently the subject of intensive research, as they allow cost‐effective and environmentally friendly production of large‐area, flexible, and when fabricated on ultrathin substrates, highly conformable devices. Among many intriguing applications, tactile and biosignal monitoring, where lightweight sensors with high wearing comfort are particularly interesting, is focused on here. The required spatiotemporal resolution of the signals is achieved by integrating the sensors in an active matrix configuration. Organic ferroelectric transducers of high uniformity, characterized, for example, by a sensitivity spread of only 1.5%, are combined with similarly uniform ultralow noise level organic thin film transistors operating below 5 V, showing, for example, a threshold voltage variation of just 0.13 V, in a 12 × 12 sensor array. The transistors transition frequency of up to 160 kHz (saturation range) and 17 kHz (linear range) allows for a high spatiotemporal resolution of ≈3 mm at a frame rate of 1400 fps. The thickness of only 2.8 µm renders the organic active matrix sensor sheet ultraflexible and therefore virtually imperceptible on the human skin. Real‐time monitoring of tactile modes in a subset of 8 × 3 pixels and of the pulse wave including heart rate and blood pressure using four sensors of the matrix is demonstrated.
Funder
Austrian Science Fund
Japan Science and Technology Agency
Japan Society for the Promotion of Science
Subject
Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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