Surface destruction and performance reduction of the ZnO nanowire arrays electrode in dye sensitization process

摘要

ZnO based dye-sensitized solar cells have been widely investigated. The limitation of the conversion efficienq is studied in this work. Obvious morphology changes of the ZnO nanowire electrode occur after a period o time sensitized in the ruthenium N719 dye ethanol solution. The surface dissolution of the ZnO nanowires am the formation of Zn~(2+)/dye aggregates have been discovered and characterized. The influence of thi sensitization duration on the cell performance is investigated and discussed. The short circuit current densit) and overall conversion efficiencies of the cells decrease extremely when the sensitization time is prolonged The results exhibit that ruthenium N719 dye is not suitable enough to the ZnO nanowire arrays electrode.