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<p>Flexible photodetectors are ideal for short-range communication in lightweight microintegrated systems. However, low-bonding interface and high-power cost of photosensitive components greatly limit their application in flexible communication systems. To address this, herein, piezophototronic effect-enhanced sensing components are proposed for flexible photodetectors. This approach leverages the piezophototronic effect to modulate nanoscale charge transport and the precision of electrohydrodynamic direct-writing to achieve controlled nanofiber assembly, thereby enhancing interfacial bonding and overall device performance. By employing electrohydrodynamic direct-writing, a copper-ammonia complex ((Cu(NH<sub>3</sub>))(CN)) nanofiber is self-stacked on a zinc oxide (ZnO) nanofiber to construct a zinc oxide and copper ammine complex (ZnO@(Cu(NH<sub>3</sub>))(CN)) photodetector with low static power consumption and high responsiveness through the combined effects of piezoelectricity and fiber self-stacking. The dark current is reduced to 1.12 × 10<sup>−7</sup> A, and the static power consumption of the photodetector is also decreased. The responsiveness is up to 13.3 A/W, with response and recovery times of 11 and 9&#xa0;ms under ultraviolet (UV) light illumination, respectively, fulfilling the requirements for highly sensitive photodetection owing to the high interface bonding. The detector's threshold voltage is tunable, ranging from 6&#xa0;V for 5 stacking layers to 20&#xa0;V for 25 stacking layers, thereby allowing the device's performance to be precisely tailored to specific application requirements. Leveraging the exceptional optoelectronic performance of the ZnO@(Cu(NH<sub>3</sub>))(CN) photodetector, this study expands the application scenarios of flexible photodetectors and demonstrates their potential in the fields of 6G technology and battlefield communication.</p> Graphical Abstract <p></p>

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Piezophototronic Effect-Enhanced Highly Sensitive Flexible Photodetectors Based on Electrohydrodynamic Direct-writing Nanofiber Self-stacking

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Xianruo Du,
  • Zhenghui Peng,
  • Yanyang Liang,
  • Chenqi Zheng,
  • Yisheng Zhong,
  • Ruixin Chen,
  • Yinuo Wang,
  • Ziheng Li,
  • Chunyu Xu,
  • Zungui Shao,
  • Yifang Liu,
  • Huatan Chen,
  • Gaofeng Zheng

摘要

Flexible photodetectors are ideal for short-range communication in lightweight microintegrated systems. However, low-bonding interface and high-power cost of photosensitive components greatly limit their application in flexible communication systems. To address this, herein, piezophototronic effect-enhanced sensing components are proposed for flexible photodetectors. This approach leverages the piezophototronic effect to modulate nanoscale charge transport and the precision of electrohydrodynamic direct-writing to achieve controlled nanofiber assembly, thereby enhancing interfacial bonding and overall device performance. By employing electrohydrodynamic direct-writing, a copper-ammonia complex ((Cu(NH3))(CN)) nanofiber is self-stacked on a zinc oxide (ZnO) nanofiber to construct a zinc oxide and copper ammine complex (ZnO@(Cu(NH3))(CN)) photodetector with low static power consumption and high responsiveness through the combined effects of piezoelectricity and fiber self-stacking. The dark current is reduced to 1.12 × 10−7 A, and the static power consumption of the photodetector is also decreased. The responsiveness is up to 13.3 A/W, with response and recovery times of 11 and 9 ms under ultraviolet (UV) light illumination, respectively, fulfilling the requirements for highly sensitive photodetection owing to the high interface bonding. The detector's threshold voltage is tunable, ranging from 6 V for 5 stacking layers to 20 V for 25 stacking layers, thereby allowing the device's performance to be precisely tailored to specific application requirements. Leveraging the exceptional optoelectronic performance of the ZnO@(Cu(NH3))(CN) photodetector, this study expands the application scenarios of flexible photodetectors and demonstrates their potential in the fields of 6G technology and battlefield communication.

Graphical Abstract