Organic homojunction diodes with a high built-in potential: Interpretation of the current-voltage characteristics by a generalized einstein relation

We realize p- and n-type doping of the organic semiconductor zinc-phthalocyanine using a novel strong organic donor. This allows us to demonstrate the first stable and reproducible organic p-n homojunctions. The diodes show very high built-in potentials, attractive, e.g., for organic solar cells. Ho...

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Bibliographic Details
Published in:Physical review letters 2005-01, Vol.94 (3), p.036601.1-036601.4, Article 036601
Main Authors: HARADA, K, WERNER, A. G, PFEIFFER, M, BLOOM, C. J, ELLIOTT, C. M, LEO, K
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in interface structures
Exact sciences and technology
Physics
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Summary:We realize p- and n-type doping of the organic semiconductor zinc-phthalocyanine using a novel strong organic donor. This allows us to demonstrate the first stable and reproducible organic p-n homojunctions. The diodes show very high built-in potentials, attractive, e.g., for organic solar cells. However, the diode characteristics cannot be described by the standard Shockley theory of the p-n junction since the ideality factor strongly increases with decreasing temperature. We show that this behavior can be explained by deviations from the Einstein relation for disordered materials.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.036601