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Stretchable photo sensor using perylene/graphene composite on ridged polydimethylsiloxane substrate.

Shawkat Ali, Jinho Bae, Chong Hyun Lee

    Optics Express
    |December 25, 2015
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    Summary

    We developed a new stretchable photo sensor for wearable electronics using a perylene/graphene composite. This sensor shows stable operation under strain and varying light conditions.

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    Area of Science:

    • Materials Science
    • Electronics Engineering
    • Nanotechnology

    Background:

    • Wearable electronics require flexible and durable sensors.
    • Existing photo sensors often lack sufficient stretchability and stability.

    Purpose of the Study:

    • To develop a stretchable photo sensor for wearable applications.
    • To investigate the performance of a perylene/graphene composite in a strain-tolerant device.

    Main Methods:

    • Fabrication of a stretchable photo sensor using a uniform ridged polydimethylsiloxane (PDMS) substrate.
    • Deposition of a perylene/graphene composite active layer via electro-hydrodynamic (EHD) technique.
    • Integration with indium tin oxide (ITO) transparent electrodes.

    Main Results:

    • The photo sensor operates stably up to 25% axial strain.
    • Resistance changes inversely with light intensity (108 MΩ at 0 lux to 87 MΩ at 400 lux).
    • Demonstrated flexibility through bendability tests (down to 0 mm) and over 1000 bending cycles.

    Conclusions:

    • The proposed stretchable photo sensor meets the demands of wearable electronics.
    • The PDMS substrate and perylene/graphene composite enable high stretchability and stable performance.
    • The EHD technique ensures uniform active layer deposition for reliable device function.