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Trap State Photoluminescence of Nanocrystalline and Bulk TiO2,: Implications for Carrier Transport

Published online by Cambridge University Press:  01 February 2011

Jeanne Louise McHale ,
Christopher C. Rich  and
Fritz J. Knorr
Jeanne Louise McHale
Affiliation:
jmchale@wsu.edu, Washington State University, Chemistry, Pullman, Washington, United States
Christopher C. Rich
Affiliation:
ccrich@wsu.edu, Washington State University, Chemistry, Pullman, Washington, United States
Fritz J. Knorr
Affiliation:
fknorr@wsu.edu, Washington State University, Chemistry, Pullman, Washington, United States
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Abstract

The visible photoluminescence of nanocrystalline TiO2 is examined in the presence of surface binding agents and as a function of vacuum annealing in order to probe the molecular nature of surface defects. The photoluminesence (PL) of bulk crystals of anatase TiO2 from (101) and (001) planes is also reported in order to test the hypothesis that electron and hole traps are spatially isolated on different crystal planes. We find that a number of hole scavengers are capable of quenching the PL associated with trapped electrons, while the ability of oxygen to quench PL through electron scavenging varies with the nature of the sample. We conclude that hole scavengers exert their influence on the PL through reaction with valence band holes rather than with spatially isolated trapped holes. Scavenging of electrons by O2, on the other hand, depends on adsorption at oxygen vacancies and varies with TiO2 sample.

Keywords

oxideluminescencedefects
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1268: Symposium EE – Defects in Inorganic Photovoltaic Materials , 2010 , 1268-EE03-08
Copyright
Copyright © Materials Research Society 2010

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