Energy level evolution at a silole/magnesium thin-film interface

Mäkinen, A. J.; Uchida, M.; Kafafi, Z. H.
June 2003
Applied Physics Letters;6/2/2003, Vol. 82 Issue 22, p3889
Academic Journal
Photoemission spectroscopy of an interface formed through step-by-step deposition of Mg onto a film of a silole derivative, 2,5-bis[6[sup ′]-(2[sup ′],2[sup ″]-bipyridyl)]-1,1-dimethyl-3,4-diphenyl silacyclopentadiene (PyPySPyPy), reveals the formation of gap states arising from electron transfer from the metal to the organic. In addition, a 0.3-eV rigid shift of the molecular orbitals toward higher binding energy is observed, while the work function of the Mg-rich PyPySPyPy surface is reduced by 0.6 eV. The observed energy level evolution elucidates how the electronic structure of the Mg/PyPySPyPy interface depends on the chemical interaction between the metal and the organic. This is important for understanding and optimizing electron injection at the Mg/PyPySPyPy interface, which can be incorporated in electronic, electro-optic, and optoelectronic devices. © 2003 American Institute of Physics.


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