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<p>Near-infrared (NIR) organic photodetectors (OPDs) offer a promising platform for skin-integrated optical communication systems, but achieving high-speed operation under mechanical stress remains a central obstacle. Here, we report a skin-conformable OPD with a 3 μm total thickness that achieves a specific detectivity calculated from noise-equivalent power of 0.84 × 10<sup>14</sup> Jones at 790 nm and a − 3 dB cut-off frequency exceeding 1 MHz, maintained under 66% compressive strain and sub-5 μm bending radius. This performance is enabled by an engineered Br-functionalized PACz hole transport layer, which facilitates efficient charge extraction without compromising mechanical resilience. When conformally mounted on human skin, the device supports angle-independent responsivity across a 0–90° range and enables wireless reception of audio-modulated signals from a 100 m distant source with a bit-error rate of 10<sup>−3</sup>. These results define a new performance regime for ultrathin, deformable NIR photodetectors by overcoming the trade-off between speed and flexibility, and demonstrate their scalable integration into skin-mounted, interactive communication systems.</p>

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Skin-conformal MHz-speed organic photodetectors for angle-free and long-range near-infrared communication

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月15日

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  • Jae-Hyun Kim,
  • Hyojeong Choi,
  • Kenjiro Fukuda,
  • Jaebin Jeong,
  • Jun-Gyu Choi,
  • Sunghoon Lee,
  • Tomoyuki Yokota,
  • Sang Min Won,
  • Joohoon Kang,
  • Yei Hwan Jung,
  • Jongin Hong,
  • Seulki Song,
  • Takao Someya,
  • Hyeok Kim,
  • Sungjun Park

摘要

Near-infrared (NIR) organic photodetectors (OPDs) offer a promising platform for skin-integrated optical communication systems, but achieving high-speed operation under mechanical stress remains a central obstacle. Here, we report a skin-conformable OPD with a 3 μm total thickness that achieves a specific detectivity calculated from noise-equivalent power of 0.84 × 1014 Jones at 790 nm and a − 3 dB cut-off frequency exceeding 1 MHz, maintained under 66% compressive strain and sub-5 μm bending radius. This performance is enabled by an engineered Br-functionalized PACz hole transport layer, which facilitates efficient charge extraction without compromising mechanical resilience. When conformally mounted on human skin, the device supports angle-independent responsivity across a 0–90° range and enables wireless reception of audio-modulated signals from a 100 m distant source with a bit-error rate of 10−3. These results define a new performance regime for ultrathin, deformable NIR photodetectors by overcoming the trade-off between speed and flexibility, and demonstrate their scalable integration into skin-mounted, interactive communication systems.