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. 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.
Harada
K
K
Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany.
Werner
A G
AG
Pfeiffer
M
M
Bloom
C J
CJ
Elliott
C M
CM
Leo
K
K