Please use this identifier to cite or link to this item:
|Title:||The role of the electrode configuration on the electrical properties of small-molecule semiconductor thin-films|
Oliveira, R. F. de
Gomes, H. L.
Bufon, C. C. B.
|Abstract:||This paper presents a systematic analysis of the electrode configuration influence on the electrical properties of organic semiconductor (OSC) thin-film devices. We have fabricated and electrically characterized a set of planar two-terminal devices. The differences in I-V characteristics between the top and bottom contact structures are presented and analyzed. Top-contact configurations have a linear current vs. electric field behavior, while the bottom-electrode devices display a transition from ohmic to spacecharge-limited conduction regime. The transition is temperature-and thickness-dependent. Finite-element calculations show that when the OSC film is connected using top electrodes, the current flows through the OSC bulk region. On the other hand, the bottom-electrode configuration allows most of the current to flow near the OSC/substrate interface. The current probes interfacial states resulting in a space-charge conduction regime. The results shed some light on the so-called "contact effects" commonly observed in organic thin-film transistors. The findings presented here have implications for both the understanding of the charge transport in OSC films and the design of organic semiconductor devices.|
|Appears in Collections:||IQ - Artigos e Outros Documentos|
IFGW - Artigos e Outros Documentos
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.