iScience | VOL. 25
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Strain-durable dark current in near-infrared organic photodetectors for skin-conformal photoplethysmographic sensors.

Publication Date May 20, 2022

Abstract

Sensitive detection of near-infrared (NIR) light is applicable to variety of optical, chemical, and biomedical sensors. Of these diverse applications, NIR photodetectors have been used as a key component for photoplethysmography (PPG) sensors. In particular, because NIR organic photodetectors (OPDs) enable fabrication of stretchable and skin-conformal PPG sensors, they are attaining tremendously increasing interest in both academia and industry. Herein, we report strain-durable and highly sensitive NIR OPDs using an organic bulk heterojunction (BHJ) layer. For effective suppression of dark current, we employed BHJ combination consisting of PTB7-Th:Y6 which forms high energy barrier against transport-injected holes. The optimized OPDs exhibited high specific detectivity up to 2.2×1012 Jones at 800nm. By constructing the devices on the parylene substrates, we successfully demonstrated stretchable NIR OPDs and high-performance skin-conformal PPG sensors.

Concepts
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Near-infrared Photodetectors
Organic Photodetectors
Near-infrared
Near-infrared Organic Photodetectors
Bulk Heterojunction
Organic Bulk Heterojunction
Parylene Substrates
Stretchable Sensors
Biomedical Sensors
Dark Current

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