Transport properties and photoconductivity of nanocrystalline PbTe(In) films

Alexandr Dobrovolsky, Vladimir Chernichkin, Ivan Belogorokhov, Zinovi Dashevsky, Vladimir Kasiyan, Ludmila Ryabova, Dmitry Khokhlov

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


Microstructure, charge transport and photoelectric properties are studied for PbTe(In) films deposited on amorphous substrates kept at different temperatures Ts during deposition. All the films have a column-like structure with the mean column diameter increasing from 60 nm at the lowest Ts = -120°C up to 300 nm at the maximal Ts =250°C. The substrate temperature increase results in appearance of a preferred orientation of grains and in an inversion of the conductivity type from hole to electron. Electric transport and photoelectric properties of the films were studied in the temperature interval 4.2 - 300 K in DC and AC modes at frequencies varied from 20 Hz up to 1 MHz. The impedance spectra analysis was done in terms of the equivalent circuit model. Modification of charge transport mechanisms is correlated with the variation of microstructure of the films grown at different substrate temperatures. Films with disordered grains possess all features of non-homogeneous systems, while the films with a preferred orientation of grains are analogous to PbTe(In) single crystals in their transport and photoelectric properties. Mechanisms of the persistent photoconductivity observed in the films are qualitatively distinguished.

Original languageEnglish
Pages (from-to)869-872
Number of pages4
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Issue number3-4
StatePublished - 27 May 2010
Event23rd International Conference on Amorphous and Nanocrystalline Semiconductors, ICANS23 - Utrecht, Netherlands
Duration: 23 Aug 200928 Aug 2009

ASJC Scopus subject areas

  • Condensed Matter Physics


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