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Synthesis and optoelectronic characterization of coronene/CdO self-powered photodiode

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Abstract

In this study, it is aimed to present the coronene/CdO hybrid heterojunction, which has not been grown epitaxially on each other before, as an alternative to optoelectronic application areas. Firstly, CdO thin film was grown on a conductive layer (ITO) using the electrochemical deposition method. Then, coronene organic semiconductor was grown on CdO thin film using thermal evaporation method and coronene/CdO hybrid heterojunction was produced. The optical analysis of the fabricated heterojunction was examined in the wavelength range of 300–850 nm, and optical parameters were determined. It was observed that the the absorption coefficient (α) value of the heterojunction was in the order of ≈106 m−1 and the Eg value (2.01 eV) was in the visible region. The diode parameters of the coronene/CdO hybrid heterojunction which showed negative differential resistance (NDR) effect behavior were determined, and it was observed that the ideality factor value was 7.58, the series resistance value was ≈103 Ω, the shunt resistance value was ≈105 Ω, the barrier height value was ≈0.3 eV, and the reverse saturation current value was ≈10–8 A. The photodetector and photovoltaic characterization of the coronene/CdO hybrid heterojunction at different light intensity values was investigated under ± 0.1 V and with zero bias. It is observed that it exhibited self-powered diode behavior under zero bias and the heterojunction was light-sensitive. The determined maximum photocurrent (Iph), responsivity (R), sensitivity and specific detectivity (D*) values were found to be 2.03 × 10–7 A, 1.53 × 10–2 A.W−1, 7.44 × 10–8 S.m.W−1 and 9.94 × 109 Jones, respectively. In addition, the Isc and Voc values increased with the increase in the light intensity and the maximum FF% value was 31.14%.

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FU was involved in conceptualization, formal analysis, investigation, methodology, project administration, resources, software, validation, visualization, writing the draft, and writing, reviewing and editing. MŞK was responsible for investigation, methodology, resources, visualization, writing the original draft, and writing, reviewing and editing. SA participated in methodology, resources, visualization, writing the original draft, and writing, reviewing and editing. MK took part in investigation, methodology, resources, writing the original draft, and writing, reviewing and editing.

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Correspondence to Fatih Unal.

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Unal, F., Kurt, M.S., Aktas, S. et al. Synthesis and optoelectronic characterization of coronene/CdO self-powered photodiode. J Mater Sci: Mater Electron 33, 25304–25317 (2022). https://doi.org/10.1007/s10854-022-09237-y

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