Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 149, Issue 5, Pages E155-E158Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1467367
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The influence of a buffer layer of a TiO2-WO3 composite material located between a TCO substrate and a TiO2 (P25) layer on photocurrent-voltage characteristics of dye-sensitized solar cells was compared. The buffer layer effectively isolated dye molecules and electrolytes from directly contacting the conducting substrate. In the presence of the buffer layer having 15-75 mol % WO3, both open-circuit photovoltage (V-oc) and short-circuit photocurrent (J(sc)) were enhanced. Analyses of scanning electron microscopy data and bandedge positions of the TiO2-WO3 films indicate that the V-oc and J(sc) increases are correlated with favorable energy levels for the electron injection from the P25 layer, and with improved interparticle electrical contacts at both the TCO/TiO2-WO3 and the TiO2-WO3/P25 junctions. (C) 2002 The Electrochemical Society.
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