Intensity-dependent relaxation of photoconductivity in nanocrystalline titania thin films | Zendy

Zhibin Xie | Zendy; V. M. Burlakov | Zendy; Bernard M. Henry | Zendy; Kiril R. Kirov | Zendy; Harry Smith | Zendy; C.R.M. Grovenor | Zendy; Hazel E. Assender | Zendy; G. A. D. Briggs | Zendy; Mitsuru Kano | Zendy; Yusuke Tsukahara | Zendy

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Intensity-dependent relaxation of photoconductivity in nanocrystalline titania thin films

Author(s) -

Zhibin Xie,

V. M. Burlakov,

Bernard M. Henry,

Kiril R. Kirov,

Harry Smith,

C.R.M. Grovenor,

Hazel E. Assender,

G. A. D. Briggs,

Mitsuru Kano,

Yusuke Tsukahara

Publication year - 2006

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.73.113317

Subject(s) - photoconductivity , nanocrystalline material , electron , relaxation (psychology) , intensity (physics) , condensed matter physics , physics , materials science , electron mobility , atomic physics , nanotechnology , optics , nuclear physics , psychology , social psychology

We have discovered that the initial rate of the post-illumination decay of photoconductivity in nanocrystalline Ti O2 depends on the intensity of the illumination. The phenomenon is described by hole detrapping processes affected by electrostatic interactions between the trapped holes, and screening of these interactions by free electrons. The analysis allows determination of both the electron concentration and the electron mobility. In our materials, the value of electron mobility μ ≈ 10-6 cm2 V-1 s-1, in good agreement with results obtained by other methods. © 2006 The American Physical Society

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