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(a) The optical transmittance of glass/ITO and glass/ITO/ZnO-Al substrates, and (b) the EQE of the inverted solar cells. The insert in (a) is the chemical structure of N719.
The photovoltaic characteristics of the ITO/ZnO-Al/P3HT:PCBM/WO3/Al solar cells, with or without interfacial modification.
Light intensity dependence of the Voc of the reference cell, which comprises no dye interlayer.
The UPS measurements of ITO/ZnO-Al substrate with and without N719 interlayer. The figures show the secondary-electron cutoff of the UPS spectra from which the work function of the substrates are determined.
The photovoltaic data of the inverted solar cells as extracted from Fig. 2, series resistance, shunt resistance, and reverse saturation current. The reverse saturation current was extracted from the current-voltage characteristics measured under dark.
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