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8714378 
Meetings & Symposia 
Investigation of organic-organic interfaces by time-resolved photocurrent, electrochemical, and photoemission techniques 
Lin, LB; Mason, MG; Young, RH; Schildkraut, DE; Borsenberger, PM; Jenekhe, SA 
1997 
1 
Materials Research Society Symposium Proceedings
ISSN: 0272-9172
EISSN: 1946-4274 
MRS 
Warrendale 
488 
689-693 
English 
Hole transporting properties and energy barriers at organic-organic interfaces relevant to electrophotographic and organic electroluminescent (EL) devices are described. Three well-known hole transporting molecules, 1,1-bis(di-4-tolylaminophenyl)cyclohexane (TAPC), N,N′- diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine (NPB), and N,N,N′,N′-tetrakis(4-tolyl)-(1,1′-biphenyl)-4, 4′-diamine (TTB) are used in this study. The ionization potentials (IP) and oxidation potentials (Eox) of these materials are determined by photoemission spectroscopy and electrochemical measurements, from which a conversion formula is obtained (IP approximately 4.5 eV+eEox). Hole transport across organic-organic interfaces is investigated by time-of-flight transient photocurrent techniques. The efficiencies of hole injection are consistent with the energy barriers, when present, at these interfaces.