Abstract
Using photoemission, inverse photoemission, and electron energy loss spectroscopy, we have probed the changes in the electronic structure of molecularly adsorbed closo-1,2-dicarbadodecaborane ( closo-C 2B 10H 12 or orthocarborane) films as a function of Na doping. The insulator gap of this film of molecular icosahedra closes with Na doping and both new occupied and unoccupied states are introduced. The Na-doped system resembles a Mott-Hubbard insulator, even at high doping levels, and demonstrates the defining role of correlation.
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