Yusaku Tagawa

Ultra‐Flexible Dual‐Band Organic Photodetectors for Visible and Near‐Infrared Sensing (Advanced Optical Materials 15/2026)

Sachi Awakura, Hiroaki Jinno, Yusaku Tagawa, Ryota Fukuzawa et autres

Flexible Sensor This cover illustrates an ultra-flexible dual-band organic photodetector for voltage-switchable visible and near-infrared light detection. The 5.6-µm-thick device attached on a human finger successfully acquires pulse wave from visible and near-infrared components, respectively, demonstrating correlation with peripheral oxygen saturation. This …

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Selective Charge Extraction Allows Fast Photomultiplication and Imaging in Rigid and Ultra‐Flexible SWIR Organic Photodiodes

Matilde Brunetta, Zhuoran Qiao, Davide Nodari, Kosei Sasaki et autres

ABSTRACT Expanding the absorption window of organic photodiodes (OPDs) over the 1000 nm benchmark is essential for bioimaging and medical applications. However, progressing into this wavelength range has proven to be a challenging task due to the scarcity of near‐infrared (NIR) semiconducting …

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Ultra‐Flexible Dual‐Band Organic Photodetectors for Visible and Near‐Infrared Sensing

Sachi Awakura, Hiroaki Jinno, Yusaku Tagawa, Ryota Fukuzawa et autres

Abstract Dual‐band organic photodetectors (DB‐OPDs) offer adaptive detection of two distinct wavelengths by switching the voltage, making them promising candidates for wearable bio‐imagers. Although many studies have been conducted on rigid DB‐OPDs to date, flexible DB‐OPD with comparable performance to rigid counterparts …

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Enhancing Environmental Stability and Mechanical Robustness of ZnO Nanoparticle Organic Photodetectors via Branched Polyethyleneimine Interlayer

Chae‐Eun Shim, Sachi Awakura, Hongting Chen, Yusaku Tagawa et autres

Precise Trap and Noise Characterisation Systems for Low-Noise Near-Infrared Organic Photodetectors

Yusaku Tagawa, Ryota Fukuzawa, Takao Someya, Tomoyuki Yokota

A body-scale textile-based electromyogram monitoring system with coaxially shielded conductive yarns

Sunghoon Lee, Kanta Takano, Wakako Yukita, Yusaku Tagawa et autres

A crucial aim of wearable electronics is to acquire biological signals from the body with high precision. However, obtaining high-accuracy electromyogram (EMG) signals from a large area surrounded by noise sources remains challenging. In this study, we present a body-scale textile-based wireless …

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Device Integration Technology for Practical Flexible Electronics Systems

Masahito Takakuwa, Kento Yamagishi, Sunghoon Lee, Yusaku Tagawa et autres

Abstract Flexible electronics are poised to serve as critical components in next‐generation wearable devices for telemedicine systems and metaverse applications, leveraging their unique ability to conform to dynamic body movements and irregular skin topography. To enable the development and optimization of practical …

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Visualization and Analysis of Perfusion Cluster Velocity From a Large Area Near-Infrared Image Sensor

Adithya Naresh, Akihiko Fujisawa, Xingle Wang, Chung-kai Chen et autres

Flexible, large area, image sensors (FLA-IS) can enable the capture of additional biomarkers not found in current wearable devices with discrete optical sensors (d-os). To demonstrate, this study utilizes an in-house, near-infrared sensitive FLA-IS system to collect data from multiple volunteers on …

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Revealing the Effects of Inert Annealing on Low-Noise Near-Infrared Organic Photodetectors via Precise Trap and Noise Characterization

Yusaku Tagawa, Ryota Fukuzawa, Takao Someya, Tomoyuki Yokota

Abstract The utilization of near-infrared (NIR) organic photodetectors (OPDs) holds considerable promise, primarily owing to their solution processability and flexibility characteristics. The recent reduction of dark current in the NIR-OPDs is critical for achieving high performance in OPDs using the narrow bandgap …

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Flexible Organic Photodetectors Capable of Selectively Detecting Visible and Near-Infrared Light

Sachi Awakura, Kosei Sasaki, Ryota Fukuzawa, Yusaku Tagawa et autres

An ultrasoft nanomesh strain sensor with extreme mechanical durability against friction for on-skin applications

Sunghoon Lee, Joo Sung Kim, Yan Wang, Yusaku Tagawa et autres

Publisher of over 50 scientific journals across the life, physical, earth, and health sciences, both independently and in partnership with scientific societies including Cell, Neuron, Immunity, Current Biology, AJHG, and the Trends Journals.

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Embedding core–shell photovoltaic nanocells in organic optoelectronics

Tomoyuki Yokota, Yusaku Tagawa

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