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Energy level alignment at interfaces between organic semiconductors and clean ferromagnetic La0.7Sr0.3MnO3 thin film contacts for spin injection
Authors:Mandy?Grobosch  Kathrin?D?rr  Ramesh?B.?Gangineni  Martin?Knupfer
Affiliation:(1) IFW Dresden, 01069 Dresden, Germany
Abstract:We have studied the energy level alignment at interfaces between clean ferromagnetic La0.7Sr0.3MnO3 and two archetype organic semiconductors, α-sexithiophene and copper-phthalocyanine, by combined X-ray and ultraviolet photoelectron spectroscopy. We observe the formation of a large interface dipole at both studied interfaces and small hole injection barriers. In addition, our results indicate a small chemical interaction between the organic materials and the La0.7Sr0.3MnO3 surface which leads to a pinning of the Fermi level and the relatively small hole injection barriers.
Keywords:  KeywordHeading"  >PACS 73.20.-r  72.25.Mk  79.60.Jv
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