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Proceedings Paper

Bipolar molecular composites: a new class of high-electron-mobility organic solids
Author(s): Liang-Bih Lin; Samson A. Jenekhe; Paul M. Borsenberger
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Paper Abstract

We describe high electron mobility in organic solids in the form of bipolar molecular composites of N,N'-bis(1,2-dimethylpropyl)-1,4,5,8-naphthalenetetracarboxylic diimide (NTDI) and tri-p-tolylaniine (TTA). The electron mobility in the NTDI/TTA composites is ~2 x 10 cm2/Vs, which is a factor of 4 to 6 higher than in pure NTDI and isone of the highest values reported for disordered organic solids. The field and temperature dependencies of the charge mobility can be described using the disorder formalism due to Bassler and co-workers, which provides an estimation of the energy width σ of the hopping site manifold. Analysis of the data gave σ=0.081 and 0.060 eV for the electron and hole mobilities in a NTDI/TTA composite of 0.5510.45 molar ratio. The energetic disorder for electron transport in the bipolar composites is substantially lower than for pure NTDI, which is 0.093 eV. The results suggest that the observed enhancement arises from a substantial reduction of energetic disorder in the electron transport manifold of the bipolar composites. The reduction of energetic disorder may be due to intermolecular charge transfer between NTDI and TTA. Such a charge transfer could stabilize the electron transport manifold by better charge delocalization, and consequently, less energetic disorder. Another possible reason for the observed enhanced electron mobility is the reduction of NTDI dimers that can act as carrier traps by the presence of TTA molecules in the bipolar composites. These results also suggest that bipolar composites represent a promising new class of high electron mobility organic solids.

Paper Details

Date Published: 9 October 1997
PDF: 6 pages
Proc. SPIE 3144, Xerographic Photoreceptors and Organic Photorefractive Materials II, (9 October 1997); doi: 10.1117/12.290247
Show Author Affiliations
Liang-Bih Lin, Univ. of Rochester and Eastman Kodak Co. (United States)
Samson A. Jenekhe, Univ. of Rochester (United States)
Paul M. Borsenberger, Univ. of Rochester and Eastman Kodak Co. (United States)


Published in SPIE Proceedings Vol. 3144:
Xerographic Photoreceptors and Organic Photorefractive Materials II
Stephen Ducharme; James W. Stasiak; Stephen Ducharme, Editor(s)

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