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<p>Chiral π-conjugated polymers are key for advancing flexible circularly polarized light (CPL) photodetectors due to their mechanical flexibility, high sensitivity, and compatibility with large-scale fabrication. However, achieving strong CPL detection and efficient charge transport in flexible chiral photodetectors remains challenging. Here, we present a novel <i>n</i>-type chiral π-conjugated polymer (<i>S</i>/<i>R</i>)-P(NDI2MH-T2) for high-performance flexible CPL photodetectors. The polymer exhibits enhanced chiroptical activity after annealing, with significant improvement in |<i>g</i><sub>abs</sub>| at 382 nm (2.34 × 10<sup>−2</sup>) and at 670 nm (1.38 × 10<sup>−2</sup>), which is attributed to improved polymer chain stacking and exciton coupling, as confirmed by molecular dynamics simulations. The phototransistors show high electron mobility (7.9 × 10<sup>−2</sup> cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>), photoresponsivity (92 A W<sup>−1</sup>), and detectivity (1.1 × 10<sup>12</sup> Jones). A flexible CPL photodetector fabricated with polydimethylsiloxane and polyethylene naphthalate substrates demonstrates reliable CPL detection with |<i>g</i><sub>ph</sub>| of 0.043. This work highlights the potential of chiral π-conjugated polymers for efficient flexible CPL photodetectors.</p>

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High-performance flexible circularly polarized light photodetectors based on chiral n-type naphthalenediimide-bithiophene polymers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月8日

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  • Ke Gao,
  • Seoyoung Kim,
  • Wenkai Zhao,
  • Xichong Ye,
  • Peng-peng Wang,
  • Le Liu,
  • Jaeyong Ahn,
  • Huagui Zhuo,
  • Zhenping Li,
  • Zhiwei Wang,
  • Gang Chang,
  • Wei Ma,
  • Mingming Zhang,
  • Guankui Long,
  • Xiaobo Shang,
  • Joon Hak Oh

摘要

Chiral π-conjugated polymers are key for advancing flexible circularly polarized light (CPL) photodetectors due to their mechanical flexibility, high sensitivity, and compatibility with large-scale fabrication. However, achieving strong CPL detection and efficient charge transport in flexible chiral photodetectors remains challenging. Here, we present a novel n-type chiral π-conjugated polymer (S/R)-P(NDI2MH-T2) for high-performance flexible CPL photodetectors. The polymer exhibits enhanced chiroptical activity after annealing, with significant improvement in |gabs| at 382 nm (2.34 × 10−2) and at 670 nm (1.38 × 10−2), which is attributed to improved polymer chain stacking and exciton coupling, as confirmed by molecular dynamics simulations. The phototransistors show high electron mobility (7.9 × 10−2 cm2 V−1 s−1), photoresponsivity (92 A W−1), and detectivity (1.1 × 1012 Jones). A flexible CPL photodetector fabricated with polydimethylsiloxane and polyethylene naphthalate substrates demonstrates reliable CPL detection with |gph| of 0.043. This work highlights the potential of chiral π-conjugated polymers for efficient flexible CPL photodetectors.