Influence of Indium Tin Oxide Surface Treatment on Spatially Localized Photocurrent Variations in Bulk Heterojunction Organic Photovoltaic Devices
NORTHWESTERN UNIV EVANSTON IL OFFICE OF RESEARCH SPONSORED PROJECTS
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A correlation between anode surface treatment and spatially localized photocurrent variations has been found in bulk heterojunction poly3-hexylthiophene6,6-phenyl- C-61-butyric acid methyl ester P3HTPCBM organic photovoltaic OPV devices. Atomic force photovoltaic microscopy was used to scan arrays of 2 m diameter OPV devices with varied indium tin oxide ITO surface treatments. The standard deviation of the average photocurrent was found to be 11.4for devices fabricated on untreated ITO, 8.6 for devices with a poly3,4-ethylenedioxythiophenepolystyrene sulfonate PEDOTPSS interlayer, and 6.7 for devices with a HCl-treated ITO surface. These results suggest that spatial variations in the structure and electronic properties of the anode surface degrade the overall performance of OPVs, including reductions in short-circuit current by up to 20, thus highlighting the importance of surface treatments that improve the homogeneity of ITO.
- Inorganic Chemistry
- Electrooptical and Optoelectronic Devices
- Solid State Physics