Baocai Du

Recent advances in flexible near infrared—short wave infrared image sensors: from materials to applications

Shubham Sharma, Sachi Awakura, Yuto Aoki, Baocai Du et autres

Near-infrared and short-wave infrared (NIR–SWIR) light reveals molecular signatures and penetrates scattering media, advantages that are greatest in direct contact with target. Rigid, conventional imagers cannot meet this requirement. Flexible imagers, by contrast, conform to skin, tissue, and curved surfaces. Here, we …

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Synergistically Enhancing Light Harvesting and Mechanical Flexibility for Ultra‐Flexible Organic Biosensors

Xiangjun Zheng, Yibo Kong, Sixing Xiong, Lijian Zuo et autres

ABSTRACT Ultra‐flexible organic optoelectronic biosensors, as key components of next‐generation wearable electronics, require devices that sufficiently harvest light, tolerate oblique illumination, and maintain mechanical compliance under bending or stretching. Herein, we report a solvent‐vapor spin‐coating (SVS) strategy combining chloroform:methanol mixed solutions, which …

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Solution-processed aqueous-insensitive transparent conductors for bio-optoelectronics

Lulu Sun, Hyunwoo Kim, Jiwon Kim, Shuxu Wang et autres

Bio-optoelectronics necessitate stable and transparent conductors for precise and consistent output of electrical signals. However, diverse aqueous environments challenge the long-term stable operation. In this study, we show a solution-processed transparent conductive nanomembrane that can be directly deposited on human skin and …

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Decoupling of hygromechanical stimuli without cross-interference enabled by distinct ion-electron charge transport

Joo Sung Kim, Yusuke Ebihara, Lulu Sun, Baocai Du et autres

Accurately decoupling mechanical stimuli and environmental factors such as humidity remains a major challenge in the development of tactile sensors, as cross-interference of these stimuli in sensing signals leads to reduced measurement accuracy and reliability. To address this, we present a distinct …

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Wearable and Waterproof Organic Optoelectronics Enabled by Interfacial Adhesion Enhancement

Sixing Xiong, Baocai Du, Kenjiro Fukuda, Takao Someya

A bending test protocol for characterizing the mechanical performance of flexible photovoltaics

Kenjiro Fukuda, Lulu Sun, Baocai Du, Masahito Takakuwa et autres

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A water-resistant, ultrathin, conformable organic photodetector for vital sign monitoring

Baocai Du, Sixing Xiong, Lulu Sun, Yusaku Tagawa et autres

Ultrathin flexible photodetectors can be conformably integrated with the human body, offering promising advancements for emerging skin-interfaced sensors. However, the susceptibility to degradation in ambient and particularly in aqueous environments hinders their practical application. Here, we report a 3.2-micrometer-thick water-resistant organic photodetector …

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Intrinsically stretchable organic photovoltaics by redistributing strain to PEDOT:PSS with enhanced stretchability and interfacial adhesion

Jiachen Wang, Yuto Ochiai, Niannian Wu, Kiyohiro Adachi et autres

Intrinsically stretchable organic photovoltaics have emerged as a prominent candidate for the next-generation wearable power generators regarding their structural design flexibility, omnidirectional stretchability, and in-plane deformability. However, formulating strategies to fabricate intrinsically stretchable organic photovoltaics that exhibit mechanical robustness under both repetitive …

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Waterproof and ultraflexible organic photovoltaics with improved interface adhesion

Sixing Xiong, Kenjiro Fukuda, Kyohei Nakano, Shin-Young Lee et autres

Ultraflexible organic photovoltaics have emerged as a potential power source for wearable electronics owing to their stretchability and lightweight nature. However, waterproofing ultraflexible organic photovoltaics without compromising mechanical flexibility and conformability remains challenging. Here, we demonstrate waterproof and ultraflexible organic photovoltaics through …

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Flexible Solution-Processed Electron-Transport-Layer-Free Organic Photovoltaics for Indoor Application

Jiachen Wang, Lulu Sun, Sixing Xiong, Baocai Du et autres

Organic photovoltaics (OPVs) have unique advantages of low weight, mechanical flexibility, and solution processability, which make them exceptionally suitable for integrating low-power Internet of Things devices. However, achieving improved operational stability together with solution processes that are applicable to large-scale fabrication remains …

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Surface-Energy-Mediated Interfacial Adhesion for Mechanically Robust Ultraflexible Organic Photovoltaics

Baocai Du, Kenjiro Fukuda, Tomoyuki Yokota, Daishi Inoue et autres

Insufficient interfacial adhesion is a widespread problem across multilayered devices that undermines their reliability. In flexible organic photovoltaics (OPVs), poor interfacial adhesion can accelerate degradation and failure under mechanical deformations due to the intrinsic brittleness and mismatching mechanical properties between functional layers. …

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Inside Front Cover: Heating‐induced aggregation control for efficient sequential‐cast organic solar cells

Donghui Li, Chuanhang Guo, Xue Zhang, Baocai Du et autres

In this work, Wang and coauthors demonstrated a heating induced aggregation strategy to manipulate the aggregation behavior of non-fullerene acceptors (NFAs) during the sequential-casting process, with the large crystalline aggregates of NFAs effectively suppressed to allow diffusion to form pseudo-bulk heterojunction OSCs …