Abstract
Efficient organic solar cells (OSCs) based on regioregular of poly (3-hexylthiophene): fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester composites have been fabricated on fluorine-doped tin oxide coated glass substrates by using a sputtered indium oxide film as a hole-transporting layer (HTL). Optimized parameters for p-type In2O3 layer fabrication have been obtained through In2O3 layer sputtering temperature modulation. Based on this HTL, photovoltaic devices have been fabricated, and a power conversion efficiency up to 1.32% has been achieved. With the help of X-ray photoelectron spectroscopy and Hall-effect measurements, we conclude that the formation of In(OH)3/InOOH on the surface of In2O3 film could increase the electrical resistivity of films and affect the performance of OSC further.
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