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Preparation and characteristics study of diamond like carbon/silicon heterojunction photodetector by pulsed laser deposition

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Abstract

In this paper, amorphous undoped diamond-like carbon films were deposited on glass and silicon substrates by pulsed laser ablation of graphite target; using nanoseconds frequency doubled Nd: YAG laser pulses. The effect of laser fluence (9.5–14.3 J/cm2) on optical, structural, morphological, and electrical properties of diamond like carbon films was studied by X-ray diffraction, Raman spectroscopy, Scanning electron microscopy, energy dispersive X-ray, Fourier transform infrared spectroscopy, photoluminescence, and UV–Vis transmittance. UV–Vis results revealed a decreased indirect optical band gap from 2.2 to 1.92 eV with increasing laser fluence from 9.5 to 14.3 J/cm2 leads. The ID/IG ratio and sp2 bonded percentage of DLC films increased with laser fluence increase. Films prepared at a higher laser fluence yield lower electrical resistivity. The dark and illuminated current–voltage characteristics at room temperature of diamond like carbon/Silicon heterojunction under the effect of laser flunce were examined and analyzed. Our results demonstrated an optimum photodetectors’ responsivity of 450 m AW−1 at 10 V bias.

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Authors and Affiliations

  1. Department of Applied Science, University of Technology, Baghdad, Iraq

    Raid A. Ismail, Ali M. Mousa & Zainab T. Hussain

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  1. Raid A. Ismail
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  2. Ali M. Mousa
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  3. Zainab T. Hussain
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Correspondence to Raid A. Ismail.

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Ismail, R.A., Mousa, A.M. & Hussain, Z.T. Preparation and characteristics study of diamond like carbon/silicon heterojunction photodetector by pulsed laser deposition. Opt Quant Electron 49, 366 (2017). https://doi.org/10.1007/s11082-017-1204-3

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