Interfaces between C60 and electrode materials (gold (Au) or indium tin oxide (In2O3 + SnO2 10 wt%, ITO)) have been investigated by means of optical absorption. For the bi-layer of C60 and Au, a clear shift in onset of absorption at long wave length (λ) region originated from Au absorption was observed. This can be attributed to the red shift of plasma frequency and decrease in electron density of Au. On the other hand, for the bi-layer of C60 and ITO, clear enhancement of absorption was observed for λ > 300 nm. The origin is suggested to be low energy charge transfer from ITO to C60, which is consistent with low Schottky barrier height at the interface. Our results suggest that electronic structures at and around the interface between an organic semiconductor and an inorganic metal are modified by charge transfer from a metal to an organic material.
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Fujiwara, A., Konishi, A., Shikoh, E. (2008). Optical Properties and Electronic Structure of Organic-Inorganic Nano-Interface. In: Bonča, J., Kruchinin, S. (eds) Electron Transport in Nanosystems. NATO Science for Peace and Security Series B: Physics and Biophysics. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9146-9_1
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