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Investigation of Organic-Organic Interfaces by Time-Resolved Photocurrent, Electrochemical, And Photoemission Techniques

  • Liang-Bih Lin (a1) (a2), M. Gary Mason (a1) (a3), Ralph H. Young (a1) (a3), Deniz E. Schildkraut (a3), Paul M. Borsenberger (a1) (a2) and Samson A. Jenekhe (a1) (a4)...

Abstract

Hole transporting properties and energy barriers at organic-organic interfaces relevant to electrophotographic and organic electroluminescent (EL) devices are described. Three wellknown 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 ∼ 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.

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Investigation of Organic-Organic Interfaces by Time-Resolved Photocurrent, Electrochemical, And Photoemission Techniques

  • Liang-Bih Lin (a1) (a2), M. Gary Mason (a1) (a3), Ralph H. Young (a1) (a3), Deniz E. Schildkraut (a3), Paul M. Borsenberger (a1) (a2) and Samson A. Jenekhe (a1) (a4)...

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