Surface topography and the spectral and photoelectric properties of intercalated molybdenum disulfide films

• Published in: Russian Journal of Physical Chemistry A Vol. 87; no. 11; pp. 1864 - 1869
• Main Authors: Ivanova, O. P., Krinichnaya, E. P., Lenenko, N. D., Golub’, A. S., Zhuravleva, T. S.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-11-2013
• Subjects: Chemistry; Chemistry and Materials Science; Physical Chemistry; Physical Chemistry of Nanoclusters and Nanomaterials; nanocrystal films; photoconductivity; intercalation; dark conductivity; molybdenum disulfide; atomic force microscopy; absorption spectra
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024413100257

The structural and photoelectric properties of nanodispersed molybdenum disulfide films intercalated with cationic organic compounds (rhodamine 6G, oxazine, triethylbenzylammonium, hexadecyltrimethylammonium, and polyvinylpyrrolidone) and hydroxocomplexes of Zn, Co, Ni, and Cd are studied. It is found that the greatest differences between the absorption spectra of MoS
2
films intercalated with compounds of various natures are observed in the range of 500–850 nm, and the conductivities (dark and photo-) of MoS
2
films intercalated with Ni or Co hydroxocomplexes rise by one or more orders of magnitude, respectively, compared to films of intercalated molybdenum disulfide. The correlation between photoconductivity and the corresponding values of dark conductivity is determined, proving that charge transport (and not generation processes) in films is the limiting step for photocurrent. It is concluded that highly conductive polycrystal films of intercalated MoS
2
with conductivities close to those in MoS
2
monocrystals are of interest for practical use in optoelectronics.