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Role of Ambience on the Diffusion of Charge Carriers in the Tio2 Layers Investigated by the Photovoltage Technique

Published online by Cambridge University Press:  11 February 2011

V. Duzhko ,
J. Rappich  and
Th. Dittrich
V. Duzhko
Affiliation:
ECE Department, New Jersey Institute of Technology, NJ 07102 Newark, USA
J. Rappich
Affiliation:
Abt. Silizium Photovoltaik, Hahn-Meitner-Institute, Kekuléstr. 5, D - 12489 Berlin, Germany
Th. Dittrich
Affiliation:
Physik Department E16, Technische Universität München, D - 85747 Garching, Germany
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Abstract

The transition from anatase to rutile crystalline phase and from continuous to porous morphology was observed by Raman spectroscopy and scanning electron microscopy, respectively, in anodic TiO2 layers as the time of anodization was increased. The mechanism of the PV formation changes from trap- limited PV in thin continuous layers to diffusion PV in thick porous layers. The generation of excess charge carriers and their subsequent separation in space are strongly dependent on the ambience (air, vacuum, water) in porous layers. The importance of polar water molecules for screening of surface ions of porous TiO2 and excess charge carriers separated in space is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 747: Symposia T/V – Crystalline Oxides on Semiconductors – Interfacial Issues for Oxide-Based Electronics , 2002 , V6.5
Copyright
Copyright © Materials Research Society 2003

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References

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