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11-mercaptoundecanoic acid(MUA)-stabilized gold nanoparticles(Au NPs)embedded in Copper phthalocyanine(CuPc)were used as the buffer layer between a poly(3-hexyl-thiophene)(P3HT)/[6,6]-phenyl C61-butyric acid methyl ester(PCBM)bulk hetero-junction and the anodic indium tin oxide(ITO)substrate.While systematic synchrotron-based grazing incidence X-ray diffraction(GIXRD)experiments demonstrated that the Au NPs present in the buffer layer can improve the microstructure of the active layer with a better lamella packing of P3HT from the surface to the interior,UV-visible absorption spectrum measurements revealed enhanced optical absorption due to the localized surface plasma resonance(LSPR)generated by the Au NPs.