Spectroscopic Ellipsometry Li Yan - Application Scientist - Thin Film Division Application Laboratory Team, HORIBA Inc, Edison NJ, USA Keywords: Nanoparticles, metamaterials, ellipsometric modeling, effective medium theory, spectroscopic ellipsometry Abstract The performance of organic solar cells based on the blends of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) is strongly influenced by blend composition and thermal annealing conditions. For high-efficiency solar cells, a nanoscale interpenetrating network with crystalline order of both constituents is the desirable architecture for the photoactive layer. To that end, recent studies have focused on how to tailor and control the morphology of the P3HT:PCBM blend, the material combination th

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