Charge injection barrier and interface dipole formation in pentacene/semimetal heterostructures

Hatch, Richard C.; Sanchez, Casey W.; Höchst, Hartmut
August 2010
Applied Physics Letters;8/30/2010, Vol. 97 Issue 9, p093303
Academic Journal
Heterostructures containing pentacene (Pn) and the semimetals Bi and Sb were grown using molecular beam epitaxy. We used photoemission spectroscopy to measure the evolution of the vacuum level, hole-injection barrier, interface dipole, and work function changes as a function of Pn and semimetal coverage. The energy levels of the semimetal/Pn/semimetal sandwich structures show symmetric final values. The Pn/semimetal interfaces are very abrupt and established after a single monolayer (∼15 Å), whereas the semimetal/Pn interfaces extend over ∼100 Å.


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