科研之友
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摘要
The C 1s core-level energy difference of surface and bulk regions of organic semiconductor films, Alq(3), bathocuproine, and Cu-phthalocyanine, are reported. For the analysis, we employed a novel method based on angle-resolved photoemission spectroscopy and target factor analysis, which we developed recently [Chem. Phys. Lett. 2011, 511, 146-150]. In contrast to the earlier studies, the core energy differences between the surface and bulk layers were much more precisely determined together with the thickness of the surface layer. The results show that the core-level energy of the outermost layer is different by from 0.2 to 0.4 eV for all of the three compounds. The finding suggests that the electrostatic polarization energy plays an important role in screening charge carriers in organic solids.
- 出版日期2012-5-10
