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Improved Photoresponse of Hybrid ZnO/P3HT Bilayered Photodetector Obtained Through Oriented Growth of ZnO Nanorod Arrays and the Use of Hole Injection Layer

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Abstract

We report highly oriented one-dimensional (1-D) growth of zinc oxide (ZnO) nanorod arrays (NRA) which were later utilized to fabricate hybrid photodiodes having the typical photodiode configuration of indium tin oxide (ITO)/ZnO/poly(3-hexylthiophene) (P3HT)/Ag. These functional hybrid bilayered photodiodes were found to have high rectification ratio under dark conditions and demonstrated enhanced responsivity under light illumination. Further, we studied the effect of an intermediate electron blocking layer of poly(ethylenedioxythiophene) doped with polystyrene sulfonate (PEDOT:PSS) on the photodiode characteristics and demonstrated ITO/ZnO/P3HT/PEDOT:PSS/Ag photodiodes, reporting very high rectification ratio and responsivity in this bilayered configuration. The observed results are explained on the basis of the increased surface area of contact between the ZnO nanorods and the P3HT, and also the efficient hole injection into the P3HT layer from the top Ag electrode.

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Authors and Affiliations

  1. Molecular and Nanoelectronics Research Group (MNRG), Department of Electrical Engineering, IIT Indore, Pithampur Auto Cluster Limited (PACL) Building, Survey No. 113/2-B, Village Hernia Khedi, Mhow, Indore, Madhya Pradesh, India

    Anubha Bilgaiyan, Tejendra Dixit & Vipul Singh

  2. Mechatronics and Instrumentation Lab, Department of Mechanical Engineering, IIT Indore, Pithampur Auto Cluster Limited (PACL) Building, Survey No. 113/2-B, Village Hernia Khedi, Mhow, Indore, Madhya Pradesh, India

    I. A. Palani

  3. Department of Material Science Engineering, IIT Indore, Pithampur Auto Cluster Limited (PACL) Building, Survey No. 113/2-B, Village Hernia Khedi, Mhow, Indore, Madhya Pradesh, India

    I. A. Palani & Vipul Singh

Authors
  1. Anubha Bilgaiyan
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  2. Tejendra Dixit
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  3. I. A. Palani
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  4. Vipul Singh
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Correspondence to Anubha Bilgaiyan.

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Bilgaiyan, A., Dixit, T., Palani, I.A. et al. Improved Photoresponse of Hybrid ZnO/P3HT Bilayered Photodetector Obtained Through Oriented Growth of ZnO Nanorod Arrays and the Use of Hole Injection Layer. J. Electron. Mater. 44, 2842–2848 (2015). https://doi.org/10.1007/s11664-015-3712-x

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  • DOI: https://doi.org/10.1007/s11664-015-3712-x

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