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    A BHJ-thin-film/liquid-electrolyte based electrochemical-sensor for visible light-detection

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    Date
    2017
    Author
    Shikoh A.S.
    Ahmad Z.
    Touati F.
    Shakoor R.A.
    Bhadra J.
    Al-Thani N.J.
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    Abstract
    The current study presents a new type of inexpensive and very sensitive bulk heterojunction (BHJ) organic photo-sensor (OPS) configuration that incorporates a layer of liquid electrolyte into the conventional BHJ photodiode arrangement. Initially, a P3HT:PCBM blend based photo-anode was deposited onto ITO substrates using spin coating. Then the semiconductor coated photo-anode was attached to a Pt/ITO counter electrode. A 40m gap between photo-anode and counter electrode was filled with a liquid (iodine based) HI-30 electrolyte. Various electrical parameters including ideality factor, series and shunt resistance were extracted from the current-voltage characteristics under dark and light conditions. The value of mobility measured under dark conditions was found to be 25.58 ? 10-6 m2 V-1 s-1. In addition, the samples were found to have a series and shunt resistance of 133.33 and 74.70k, respectively. Under illumination, the fabricated photodiodes exhibited a linear current-irradiance relationship, with a rapid response time, when exposed to transient light, thus making the newly proposed hybrid BHJ photo-diode configuration a potential alternative to the conventional photo-sensors.
    DOI/handle
    http://dx.doi.org/10.1039/c7ra06193e
    http://hdl.handle.net/10576/31438
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    • Electrical Engineering [‎2840‎ items ]

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