Small Organic Molecules

Chapter
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 52)

Abstract

In order to improve devices based on organic thin films like organic light emitting diodes (OLEDs) and organic photo voltaic (OPV) cells, the molecular orientation has to be determined and optimized to increase the carrier mobility and the light emission and absorption within the layers. As many of the organic molecules possess an intrinsic molecular anisotropy, molecular ordering will induce optical and electrical anisotropy in the films. The optical anisotropy can be used to determine the average molecular orientation by modeling the anisotropic dielectric function using ellipsometric measurements. An overview of the procedure, valid for planar molecules, will be given in the first part of this chapter, with the main focus on the Phthalocyanine molecular class. The second part of the chapter focuses on vacuum ultra violet (VUV) ellipsometric measurements and the sensitivity gain at ultra-low coverages. Here the discussion will be restricted to optically isotropic films.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Semiconductor PhysicsTechnische Universität ChemnitzChemnitzGermany

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