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<p>Blackbody-sensitive room-temperature photodetectors with ultrabroadband response from the short to very long-wave infrared (VLWIR) range are highly desirable for optical communication, industrial gas leakage detection, night vision, and atmosphere surveillance. Although two-dimensional (2D) semiconductors with narrow bandgaps have shown promise in uncooled short and mid-wave infrared (SWIR and MWIR) detection, achieving blackbody responses extending to long-wave infrared (LWIR) or even the VLWIR region at room temperature remains a challenge. Here, we report a bioinspired room-temperature blackbody-sensitive self-adapted ultrabroadband detector utilizing the 2D flat-band quantum material Nb<sub>3</sub>I<sub>8</sub>, engineered through an electronic and phononic band strategy. Our study reveals that Nb<sub>3</sub>I<sub>8</sub> exhibits enhanced SWIR absorption due to electron flat-bands induced high density of states (DOS) and dipole transition probability. Owing to its strong anharmonicity with phonon flat-band characteristics, the phonon propagation is prohibited, which contributes to low thermal conductivity and enhances the heat localization, resulting in a sensitive bolometric response to blackbody radiation from λ = 2.5 μm to 20 μm. Our work not only represents a breakthrough for 2D materials with room-temperature LWIR–VLWIR blackbody detection ability, but also paves the way for implementing blackbody-sensitive ultrabroadband photodetectors by exploiting flat-band quantum materials.</p>

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Flat-band quantum materials empowering self-adapted ultrabroadband detectors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月7日

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  • Jialin Li,
  • Xun Ge,
  • Junjian Mi,
  • Hailu Wang,
  • Jiachang Chen,
  • Runzhi He,
  • Fang Zhong,
  • Mengwen Zhan,
  • Cong Hu,
  • Zhen Wang,
  • Xiaohao Zhou,
  • Xiangfan Xu,
  • Zhuan Xu,
  • Piotr Martyniuk,
  • Antoni Rogalski,
  • Fang Wang,
  • Peng Wang,
  • Zhongkai Liu,
  • Qing Li,
  • Linjun Li,
  • Weida Hu

摘要

Blackbody-sensitive room-temperature photodetectors with ultrabroadband response from the short to very long-wave infrared (VLWIR) range are highly desirable for optical communication, industrial gas leakage detection, night vision, and atmosphere surveillance. Although two-dimensional (2D) semiconductors with narrow bandgaps have shown promise in uncooled short and mid-wave infrared (SWIR and MWIR) detection, achieving blackbody responses extending to long-wave infrared (LWIR) or even the VLWIR region at room temperature remains a challenge. Here, we report a bioinspired room-temperature blackbody-sensitive self-adapted ultrabroadband detector utilizing the 2D flat-band quantum material Nb3I8, engineered through an electronic and phononic band strategy. Our study reveals that Nb3I8 exhibits enhanced SWIR absorption due to electron flat-bands induced high density of states (DOS) and dipole transition probability. Owing to its strong anharmonicity with phonon flat-band characteristics, the phonon propagation is prohibited, which contributes to low thermal conductivity and enhances the heat localization, resulting in a sensitive bolometric response to blackbody radiation from λ = 2.5 μm to 20 μm. Our work not only represents a breakthrough for 2D materials with room-temperature LWIR–VLWIR blackbody detection ability, but also paves the way for implementing blackbody-sensitive ultrabroadband photodetectors by exploiting flat-band quantum materials.