Ultraflexible Near‐Infrared Organic Photodetectors for Conformal Photoplethysmogram Sensors
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- Sungjun Park
- Center for Emergent Matter Science RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
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- Kenjiro Fukuda
- Center for Emergent Matter Science RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
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- Ming Wang
- Departments of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
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- Chulhyo Lee
- Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
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- Tomoyuki Yokota
- Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
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- Hanbit Jin
- Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
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- Hiroaki Jinno
- Center for Emergent Matter Science RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
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- Hiroki Kimura
- Center for Emergent Matter Science RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
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- Peter Zalar
- Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
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- Naoji Matsuhisa
- Electrical and Electronic Engineering and Information Systems The University of Tokyo 7‐3‐1 Bunkyo‐ku Tokyo 113‐8656 Japan
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- Shinjiro Umezu
- Department of Modern Mechanical Engineering Waseda University 3‐4‐1 Okubo Shinjuku‐ku Tokyo 169‐8555 Japan
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- Guillermo C. Bazan
- Departments of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
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- Takao Someya
- Center for Emergent Matter Science RIKEN 2‐1 Hirosawa Wako Saitama 351‐0198 Japan
Description
<jats:title>Abstract</jats:title><jats:p>Flexible organic optoelectronic devices simultaneously targeting mechanical conformability and fast responsivity in the near‐infrared (IR) region are a prerequisite to expand the capabilities of practical optical science and engineering for on‐skin optoelectronic applications. Here, an ultraflexible near‐IR responsive skin‐conformal photoplethysmogram sensor based on a bulk heterojunction photovoltaic active layer containing regioregular polyindacenodithiophene‐pyridyl[2,1,3]thiadiazole‐cyclopentadithiophene (PIPCP) is reported. The ultrathin (3 µm thick) photodetector exhibits unprecedented operational stability under severe mechanical deformation at a bending radius of less than 3 µm, even after more than 10<jats:sup>3</jats:sup> bending cycles. Deliberate optimization of the physical dimensions of the active layer used in the device enables precise on/off switching and high device yield simultaneously. The response frequency over 1 kHz under mechanically deformed conditions facilitates conformal electronic sensors at the machine/human interface. Finally, a mechanically stretchable, flexible, and skin‐conformal photoplethysmogram (PPG) device with higher sensitivity than those of rigid devices is demonstrated, through conformal adherence to the flexuous surface of a fingerprint.</jats:p>
Journal
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- Advanced Materials
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Advanced Materials 30 (34), 1802359-, 2018-07-08
Wiley
