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Electrical Characterization of ZnInSe2/Cu0.5Ag0.5InSe2 Thin-Film Heterojunction

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Abstract

ZnInSe2/Cu0.5Ag0.5InSe2 diode structures have been fabricated by thermal evaporation of stacked layers on indium tin oxide-coated glass substrates. Temperature-dependent dark current–voltage measurements were carried out to extract the diode parameters and to determine the dominant conduction mechanisms in the forward- and reverse-bias regions. The heterostructure showed three order of magnitude rectifying behavior with a barrier height of 0.72 eV and ideality factor of 2.16 at room temperature. In the high forward-bias region, the series and shunt resistances were calculated with the help of parasitic resistance relations, yielding room-temperature values of 9.54 × 102 Ω cm2 and 1.23 × 103 Ω cm2, respectively. According to the analysis of the current flow in the forward-bias region, abnormal thermionic emission due to the variation of the ideality factor with temperature and space-charge-limited current processes were determined to be the dominant conduction mechanisms in this heterostructure. In the reverse-bias region, the tunneling mechanism was found to be effective in the leakage current flow with trap density of 106 cm−3. Spectral photocurrent measurements were carried out to investigate the spectral working range of the device structure. The main photocurrent peaks observed in the spectrum corresponded to the band-edge values of the active thin-film layers.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Atilim University, 06836, Ankara, Turkey

    H. H. Gullu

  2. Department of Physics, Middle East Technical University, 06800, Ankara, Turkey

    M. Parlak

  3. Center for Solar Energy Research and Applications (GÜNAM), Middle East Technical University, 06800, Ankara, Turkey

    M. Parlak

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  1. H. H. Gullu
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  2. M. Parlak
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Gullu, H.H., Parlak, M. Electrical Characterization of ZnInSe2/Cu0.5Ag0.5InSe2 Thin-Film Heterojunction. J. Electron. Mater. 48, 3096–3104 (2019). https://doi.org/10.1007/s11664-019-07070-4

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