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Organic photodetectors for use in medical sensors, blood oxygen recognition, and temperature measurement

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Abstract

In this work was carried out the electrical and optical characterization of sensitives in near infrared spectrum of PET/ITO/PEDOT:PSS/P3HT:PCBM/Al and PET/ITO/PEDOT:PSS/P3HT:PCBM/Ag/AgCl photodiodes for its application as blood oxygenation and temperature sensors, covering large areas and detecting wavelengths from 600–940 nm with an incident power of 25–30 mW under − 3 V reverse bias. The photodiodes exhibit responsivities around 10−3A/W, specific detectivity around 106Hz1/2/W and dark current around 10−4A. In blood oxygenation monitoring, the device exploits the differential absorption of blood at 600–700 nm (deoxygenated) and 940 nm (oxygenated), blocking light transmission within this range. The percentage of photoinduced current is derived from the characteristics I–V curves and the temperature measurement relies on changes in I–V curves and the disparity in total photoinduced current.

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Data availability

All experimentation and measurements were carried out in the teaching laboratories of both ESFM and CNMN, which are both part of the Instituto Politécnico Nacional. The following personnel were responsible for conducting the measurements. Dr. Luis Moreno oversaw FTIR spectroscopy, Dr. Hugo Martínez was in charge of SEM, and Dr. Jorge Sastré was in charge of VIS–NIR. For access to any data relating to the materials and experimentation utilized in this study, kindly refer to the corresponding. Additionally, the specific characterization and experimentation data will be made available in the repository of the thesis entitled “Fotodiodos Orgánicos Flexibles a Base de la Heterounión de Bulto P3HT:PCBM” which is part of the Master's program in Physico-Mathematical Sciences at ESFM-IPN. This will be accessible in due course after January 2024.

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Acknowledgments

This work was supported by Instituto Politécnico Nacional (IPN), Secretaría de Investigación y Posgrado (SEPI) through projects numbers 20231318 & 20231431. KDCM is grateful to Consejo Nacional de Ciencia y Tecnología (CONACyT) for its financial support throughout my Master of Science Program. RGA and JOL are grateful to COFAA-IPN, EDD-IPN and EDI-IPN for support through academic fellowships.

Funding

This research was financially supported by project numbers 20231318 and 20231431 from the Instituto Politécnico Nacional through the Secretaría de Investigación y Posgrado (SIP).

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Authors and Affiliations

  1. Escuela Superior de Física y Matemáticas del Instituto Politécnico Nacional, Gustavo A. Madero, Ciudad de México, Mexico

    Karla Desirée Calderón Melchor, R. Gómez-Aguilar & Jaime Ortíz López

  2. Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del Instituto Politécnico Nacional, Gustavo A. Madero, Ciudad de México, Mexico

    R. Gómez-Aguilar

Authors
  1. Karla Desirée Calderón Melchor
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  2. R. Gómez-Aguilar
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  3. Jaime Ortíz López
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Contributions

Below is the contribution of each of the authors to this paper. KDCM and RGA were responsible for designing, constructing and electrically characterizing the organic photodiodes. JOL was responsible for the optical characterization of the films.

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Correspondence to Karla Desirée Calderón Melchor.

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None of the corresponding authors has any sort of conflict of interest. Author KDCM have a personal interest in the publication for her MSc degree.

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Melchor, K.D.C., Gómez-Aguilar, R. & López, J.O. Organic photodetectors for use in medical sensors, blood oxygen recognition, and temperature measurement. MRS Advances (2024). https://doi.org/10.1557/s43580-024-00812-5

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