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Laser synthesis of 2D structures for photo-thermo sensors with high sensitivity

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Abstract

Semiconductors are considered as promising materials for the fabrication of photo-thermo sensors with high sensitivity. Therefore, here we propose to synthesize of amorphous 2D single-layered structures with high thermo-photosensitivity by using photons generated by a KrF* laser radiation (λ = 248 nm, τFWHM ≤ 25 ns) in the reaction of copper (Cu) atoms with methane (CH4) molecules by reactive pulsed laser deposition (RPLD) process. Optimum conditions were found out to synthesize of these structures with the thickness of (56–160) nm. X-ray diffraction analysis evidenced either amorphous or polycrystalline structures on the deposits. Element analysis was carried out by energy-dispersive X-ray spectroscopy (EDXS). The semiconductor temperature trend was detected with the variable energy band gap (Eg) in the range of (0.17–1.0) eV depending on substrate temperature, CH4 pressure and structures’ thickness. The highest photosensitivity of these structures was high as 640 V/W at white light power density ~ 6 × 10–3 W/cm2 and the highest thermo-sensitivity (Seebeck coefficient) was high as 10.5 mV/K. An interpretation is provided for thermo-photosensitivity behaviour. The amorphous 2D single-layered structures were synthesized by laser radiation for the first time with such superior thermo-photo properties. Therefore, such structures are exceptional candidates for a new generation of effective thermo-photo sensors operating at moderate temperatures.

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Acknowledgements

N.Stefan and S.A.Mulenko express the gratitude to the support of National Academy of Sciences of Ukraine and Romanian Academy in the frame of the theme “Synthesis of nanostructured and heterostructured materials for sensors and energy converters” and N. Stefan acknowledges the support of Romania National Authority for Research and Innovation (UEFISCDI) under PN 16N/2020 Nucleus Program. S.A.Mulenko and other authors acknowledge the support of National Academy of Sciences of Ukraine to the support of the theme No. 0118U000416 and The State Financed Program “Support for the development of priority arrear of scientific research” KPKVK No. 6541230-3A.

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Authors and Affiliations

  1. National Institute for Lasers, Plasma and Radiation Physics, PO Box MG-54, 77125, Magurele, Romania

    N. Stefan

  2. G. V. Kurdyumov Institute for Metal Physics NAS of Ukraine, 36, Academician Vernadsky Blvd., Kyiv, 03142, Ukraine

    S. A. Mulenko & M. A. Skoryk

  3. State Enterprise “Research Institute of Microdevices” STC “Istitute for Single Crystals”, NAS of Ukraine, 3, Severo-Syretska, Kyiv, 04136, Ukraine

    V. M. Popov

  4. V. F. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine, 41, Prospect Nauki, Kyiv, 03028, Ukraine

    O. Yo. Gudymenko

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  1. N. Stefan
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  2. S. A. Mulenko
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  5. O. Yo. Gudymenko
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Correspondence to S. A. Mulenko.

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Stefan, N., Mulenko, S.A., Skoryk, M.A. et al. Laser synthesis of 2D structures for photo-thermo sensors with high sensitivity. Appl. Phys. B 126, 171 (2020). https://doi.org/10.1007/s00340-020-07521-5

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