Photoconductivity of nanocrystalline SnO2 sensitized with colloidal CdSe quantum dots

R. B. Vasiliev, A. V. Babynina, O. A. Maslova, M. N. Rumyantseva, L. I. Ryabova, A. A. Dobrovolsky, K. A. Drozdov, D. R. Khokhlov, A. M. Abakumov, A. M. Gaskov

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

A highly reproducible photoresponse is observed in nanocrystalline SnO 2 thick films sensitized with CdSe quantum dots. The effect of the SnO2 matrix microstructure on the photoconductivity kinetics and photoresponse amplitude is demonstrated. The photoresponse of the sensitized SnO2 thick films reaches more than two orders of magnitude under illumination with the wavelength of the excitonic transition of the quantum dots. Long-term photoconductivity kinetics and photoresponse dependence on illumination intensity reveal power-law behavior inherent to the disordered nature of SnO2. The photoconductivity of the samples rises with the coarsening of the granular structure of the SnO2 matrix. At the saturation region, the photoresponse amplitude remains stable under 10 4 pulses of illumination switching, demonstrating a remarkably high stability.

Original languageEnglish
Pages (from-to)1005-1010
Number of pages6
JournalJournal of Materials Chemistry C
Volume1
Issue number5
DOIs
Publication statusPublished - 7 Feb 2013
Externally publishedYes

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