Preview

Fine Chemical Technologies

Advanced search

STUDY OF MECHANISMS OF LIGHT ABSORPTION IN TITANIUM DIOXIDE FILMS

https://doi.org/10.32362/2410-6593-2016-11-4-50-55

Full Text:

Abstract

This work is devoted to comparison of optical absorption value of titanium dioxide coatings obtained by means of reactive thermal evaporation (RTE) and its activated species (ARTE), as well as to study on the dependence of the absorption coefficient of the coatings on the process parameters. Special attention is paid to the study of the influence of the films nonstoichiometry on absorption in the visible and near-infrared ranges of the spectrum. The results allow concluding that the dominant mechanism responsible for absorption in titanium dioxide films in the near-infrared range of the spectrum is the deviation from the stoichiometric composition. This deviation is caused by the presence of defects in the coating structure such as oxygen vacancies (ions Ti3+), which are seen as electron traps. As oxygen pressure and ionic current increase, the absorption of titanium dioxide films is reduced, and films with a composition closer to stoichiometric are obtained. In turn, the absorption of titanium dioxide in the visible spectrum (at wavelengths of 532 nm and 670 nm) has less to do with defects in stoichiometry, in contrast to contaminating impurities contained in the starting material, in the vacuum chamber and in the jet gas.

About the Authors

V. V. Novopashin
M.F. Stelmakh Research Institute «Polus»
Russian Federation
Moscow, 117342 Russia


L. A. Skvortsov
M.F. Stelmakh Research Institute «Polus»
Russian Federation
Moscow, 117342 Russia


M. I. Skvortsova
Moscow Technological University (Institute of Fine Chemical Technologies)
Russian Federation
Moscow, 119571 Russia


References

1. Maissel L.I., Glang R. Handbook of thin film technology. New York: McGraw-Hill, 1970. 800 p.

2. Rao K.N. // Opt. Eng. 2002. V. 41. P. 2357–2364.

3. Zverev G.M., Levchuk E.A., Skvortsov L.A. // Kvantovaya elektronika (Quantum Electronics). 1977. V. 4. № 2. P. 413–416. (in Russ.)

4. Kolodny G.Ya., Levchuk E.A., Mosievsky V.A., Novopashin V.V., Skvortsov L.A., Poletaev V.N. // Elektronnaya tekhnika (Electronics Technic). Ser. 11. Lazernaya tekhnika i elektronika (Laser Technics and Electronics). 1988. V. 48. № 4. P. 100–105. (in Russ.)

5. Narasimha K.R. // Proc. SPIE. 1989. V. 1019. Thin Film Technologies III. P. 49–55.

6. Ebert J. // Thin Solid Films. 1980. V. 1. P. 43–47.

7. Zverev G.M., Kudryavceva A.P., Mikhailova T.N., Naumov V.S., Pashkov V.A., Skvortsov L.A. // Elektronnaya tekhnika (Electronics Technic). Ser. 11. Lazernaya tekhnika I elektronika (Laser Technics and Electronics). 1979. V. 2. P. 82–86. (in Russ.)

8. Nordal P.E., Kanstad S. O. // Phys. Scr. 1979. V. 20. P. 659–663.

9. Zverev G.M., Skvortsov L.A. // Izvestiya AN SSSR (Bulletin of the Russian Academy of Sciences: Physics). 1981. V. 45. P. 644–646. (in Russ.)

10. Santos R., Miranda L.C.M. // J. Appl. Phys. 1981. V. 52. P. 4194–4199.

11. Lopatkin V.N., Sidoryk O.E., Skvortsov L.A. // Kvantovaya elektronika (Quantum Electronics). 1985. V. 12. P. 339–346. (in Russ.)

12. Mandelis A., Riopel Y. // J. Vac. Sci. Technol. A. 2000. V. 18. № 2. P. 705–708.

13. Emeline A., Salinaro A., Ryabchuk V., Serpone N. // Int. J. Photoenergy. 2001. V. 3. P. 1–16.

14. Hoffmann M., Martin S., Choi W., Bahnemann D. // Chem. Rev. 1995. V. 95. P. 69–96.

15. Zverev G.M., Kolyadin S.A., Levchuk E.A., Skvortsov L.A. // Kvantovaya elektronika (Quantum Electronics). 1985. V. 12. № 2. P. 1882–1888. (in Russ.)

16. Skvortsov L.A. // Quantum Electronics. 2010. V. 40. P. 59–63.


Review

For citations:


Novopashin V.V., Skvortsov L.A., Skvortsova M.I. STUDY OF MECHANISMS OF LIGHT ABSORPTION IN TITANIUM DIOXIDE FILMS. Fine Chemical Technologies. 2016;11(4):50-55. https://doi.org/10.32362/2410-6593-2016-11-4-50-55

Views: 369


ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)