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<p>Semitransparent organic photodetectors (ST-OPDs) are promising for applications in smart windows and electronic displays due to their inherent transparency. However, their transmittance is often limited by the low transmittance of conventional electrodes. In this work, we developed a cost-effective and facile transfer printing process for fabricating PEDOT:PSS top electrodes, which were subsequently used to construct ST-OPDs. The resulting PEDOT: PSS electrodes exhibit excellent optical transmittance, exceeding 90% across the ultraviolet-visible-near infrared spectrum. Consequently, the ST-OPDs based on these electrodes achieve an impressive average visible transmittance (AVT) of 74.8% and a specific detectivity of exceeding 5 × 10<sup>11</sup> Jones. Moreover, the high transparency of the PEDOT:PSS electrodes enables dual-sided responsiveness, allowing for heart rate monitoring from both sides in photoplethysmography tests, a feature that facilitates seamless integration with readout circuits. Additionally, the transfer-printing method exhibits broad applicability across various active layers. These findings highlight the potential of our transfer printing approach for fabricating high-performance ST-OPDs, paving the way for integratable, biocompatible, and invisible optical-sensing applications in transparent electronics and beyond.</p>

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Highly transparent organic photodetectors with transfer-printed PEDOT:PSS top electrodes

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Jun Ma,
  • Jiahui Wang,
  • Zhongxiang Peng,
  • Junli Hu,
  • Jun Liu,
  • Yichun Liu

摘要

Semitransparent organic photodetectors (ST-OPDs) are promising for applications in smart windows and electronic displays due to their inherent transparency. However, their transmittance is often limited by the low transmittance of conventional electrodes. In this work, we developed a cost-effective and facile transfer printing process for fabricating PEDOT:PSS top electrodes, which were subsequently used to construct ST-OPDs. The resulting PEDOT: PSS electrodes exhibit excellent optical transmittance, exceeding 90% across the ultraviolet-visible-near infrared spectrum. Consequently, the ST-OPDs based on these electrodes achieve an impressive average visible transmittance (AVT) of 74.8% and a specific detectivity of exceeding 5 × 1011 Jones. Moreover, the high transparency of the PEDOT:PSS electrodes enables dual-sided responsiveness, allowing for heart rate monitoring from both sides in photoplethysmography tests, a feature that facilitates seamless integration with readout circuits. Additionally, the transfer-printing method exhibits broad applicability across various active layers. These findings highlight the potential of our transfer printing approach for fabricating high-performance ST-OPDs, paving the way for integratable, biocompatible, and invisible optical-sensing applications in transparent electronics and beyond.