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Issue 56, 2017, Issue in Progress
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A BHJ-thin-film/liquid-electrolyte based electrochemical-sensor for visible light-detection

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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 40 µm 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 Ω and 74.70 kΩ, 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.

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

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Publication details

The article was received on 03 Jun 2017, accepted on 10 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7RA06193E
Citation: RSC Adv., 2017,7, 35445-35450
  • Open access: Creative Commons BY license
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    A BHJ-thin-film/liquid-electrolyte based electrochemical-sensor for visible light-detection

    A. S. Shikoh, Z. Ahmad, F. Touati, R. A. Shakoor, J. Bhadra and N. J. Al-Thani, RSC Adv., 2017, 7, 35445
    DOI: 10.1039/C7RA06193E

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