STUDY OF THE OPTICAL PROPERTIES OF THIN LAYERS OF ZINC OXIDE ZnO OBTAINED BY THE SOL-GEL METHOD
Abstract
Currently, the actual direction is the search for functional layers for various optoelectronic devices. A promising candidate as a basis for many such structures is zinc oxide (ZnO), which combines a number of unique optical and photoelectric properties. However, the characteristics of ZnO thin films can vary significantly depending on the chosen synthesis method and specific production conditions. One of the varieties of the sol-gel method suitable for the synthesis of nanoscale films is the dip-coating method. The paper presents the results of the synthesis of thin films of zinc oxide on glass substrates by the method of vertical drawing from ZnO alcohol sol. The effect of the elongation rate on the structural and optical properties of synthesized ZnO films was studied using spectral ellipsometry and spectral photometry. By the method of spectral ellipsometry, it was found that the change in the rate of elongation significantly affects the thickness and porosity of the synthesized zinc oxide layers. The analysis of the obtained dependence of the film thickness on the pulling speed showed that in the vertical pulling method, the growth of zinc oxide on glass substrates can be realized in two modes: in capillary forces mode and in drying mode. At the same time, transmission spectra were measured for synthesized ZnO films by spectral photometry, the analysis of which showed the effect of the elongation rate on the position of the edge of fundamental absorption. It was found that the main cause of the resulting.
References
V.D. Svoystva oksida tsinka pri nizkikh i srednikh temperaturakh [Properties of zinc oxide at
low and medium temperatures], Fizika nizkikh temperature [Physics of low temperatures],
2011, No. 37 (3), pp. 289-300.
2. Zhang X.M., Lu M.Y., Zhang Y., Chen L.J., Wang Z.L. Fabrication of a high-brightness bluelight-
emitting diode using a ZnO-nanowire array grown on p-GaN thin film, Adv. Mater.,
2009, Vol. 21, No. 27, pp. 2767-2770.
3. Tarasov A.P. i dr. Analiz lazernoy generatsii tetrapodov ZnO, poluchennykh metodom
karbotermicheskogo sinteza [Analysis of laser generation of ZnO tetrapods obtained by
carbothermic synthesis], Pis'ma v Zhurnal eksperimental'noy i teoreticheskoy fiziki [Letters to
the Journal of Experimental and Theoretical Physics. – 2019. – T. 110, №. 11. – S. 750-754.
4. Chumakov A.N., Mukhurov N I., Denisyuk S V., Shevchenok A.A., Baran L.V., Raychenok T.F.,
Bosak N.A. Morfologicheskie, opticheskie i fotolyuminestsentnye svoystva tonkikh plenok
ZnO na podlozhke Al2O3 [Analysis of laser generation of ZnO tetrapods obtained by
carbothermic synthesis], Izvestiya Natsional'noy akademii nauk Belarusi. Seriya fizikomatematicheskikh
nauk [Letters to the Journal of Experimental and Theoretical Physics], 2018,
Vol. 54, No. 3, pp. 91-95.
5. Tuzovskiy V.K., Gavrilov S.A., Terashkevich I.M. Solnechnye elementy s passiviruyushchim
sloem ZnO:Al, poluchennym metodom ALD [Solar cells with a ZnO:Al passivating layer obtained
by the ALD method], Neorganicheskie materialy [Inorganic materials], 2015, Vol. 51,
No. 11, pp. 1205-1205.
6. Lerer A.M., Timoshenko P.E., Chernikova T.Yu. Dispersionnye kharakteristiki opticheskikh
volnovodov na osnove ZnO- nanosterzhney [Dispersion characteristics of optical waveguides
based on ZnO-nanorods], Radiotekhnika i elektronika [Radio Engineering and Electronics],
2016, Vol. 61, No. 6, pp. 1-5.
7. Xue F. et al. Piezotronic effect on ZnO nanowire film based temperature sensor, ACS applied
materials & interfaces, 2014, Vol. 6, No. 8, pp. 5955-5961.
8. Soltabayev B., Mentbayeva A., Acar S. Enhanced gas sensing properties of in doped ZnO thin
films, Materials Today: Proceedings, 2022, Vol. 49, pp. 2495-2500.
9. Xu Z. et al. Photoconductive UV detectors based on ZnO films prepared by sol-gel method,
Journal of sol-gel science and technology, 2005, Vol. 36, No. 2, pp. 223-226.
10. Nikolaeva N.S., Ivanov V.V., Shubin A.A. Sintez vysokodispersnykh form oksida tsinka:
khimicheskoe osazhdenie i termoliz [Synthesis of highly dispersed forms of zinc oxide: chemical
precipitation and thermolysis], Zhurnal Sibirskogo federal'nogo universiteta. Khimiya
[Journal of the Siberian Federal University. Chemistry], 2010, Vol. 3, No. 2, pp. 153-173.
11. Temirov A.T., Shaikhov D.A., Magomedov M.A. Osnovnye metody polucheniya plenok ZnO
[Basic methods of obtaining ZnO films], Sistemnye tekhnologii [System technologies], 2018,
No. 3 (28), pp. 104-107.
12. Laurenti M., Cauda V. Porous zinc oxide thin films: Synthesis approaches and applications,
Coatings, 2018, Vol. 8, No. 2, pp. 67.
13. Ceratti D.R. et al. A new dip coating method to obtain large‐surface coatings with a minimum
of solution, Advanced Materials, 2015, Vol. 27, No. 34, pp. 4958-4962.
14. Malek M.F. et al. Influence of various sol concentrations on stress/strain and properties of ZnO
thin films synthesised by sol–gel technique, Thin Solid Films, 2013, Vol. 527, pp. 102-109.
15. Faustini M. et al. Preparation of sol-gel films by dip-coating in extreme conditions, The Journal
of Physical Chemistry C, 2010, Vol. 114, No. 17, pp. 7637-7645.
16. Ohyama M., Kouzuka H., Yoko T. Sol-gel preparation of ZnO films with extremely preferred orientation
along (002) plane from zinc acetate solution, Thin solid films, 1997, Vol. 306, No. 1, pp. 78-85.
17. Fujiwara H. Spectroscopic ellipsometry: principles and applications. John Wiley & Sons,
2007, 388 p.
18. Bouzouraa M.B. et al. Comparative study of ZnO optical dispersion laws, Superlattices and
Microstructures, 2017, Vol. 104, pp. 24-36.
19. Tang X., Yan X. Dip-coating for fibrous materials: mechanism, methods and applications,
Journal of Sol-Gel Science and Technology, 2017,Vol. 81, No. 2, pp. 378-404.
20. Shelemanov A.A. i dr. Vliyanie polivinilpirrolidona na strukturu i opticheskie svoystva
ZnO-MgO nanokompozitov, poluchennykh polimerno-solevym metodom [The effect of
polyvinylpyrrolidone on the structure and optical properties of ZnO-MgO nanocomposites obtained
by the polymer-salt method], Optika i spektroskopiya [Optics and spectroscopy], 2021,
Vol. 129, No. 9, pp. 1176-1181.
21. Vakalov D.S. i dr. Effekt razmernogo kvantovaniya v nanochastitsakh ZnO, poluchennykh
zol'-gel' metodom [The effect of dimensional quantization in ZnO nanoparticles obtained by
sol-gel method], Vestnik Severo-Kavkazskogo gosudarstvennogo tekhnicheskogo universiteta
[Bulletin of the North Caucasus State Technical University], 2012, No. 4, pp. 11-14.
22. Berger R. et al. Study on porosity in zinc oxide ultrathin films from three-step MLD Zn-hybrid
polymers, Materials, 2021, Vol. 14, No. 6, pp. 1418.
