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Device Performance of Bottom-Contact OFETs
Generally, the performance of bottom-contact OFETs is inferior to that of top-contact devices. It is due to
a large hole injection barrier between metal electrode and organic semiconductor, and due to poor
growth of the organic semiconductors on the metal electrodes.
 
     
 
Tuning of Au Work Functions with Self-Assembled Monolayer
Using Self-Assembled Monolayer (SAM), which has a strong directionality, is one of the attractive
methods to modify electrodes. SAMs can change the effective work function of metal electrode surfaces,
and reduce hole injection barrier between metal electrode and organic semiconductors. In our laboratory,
gold surfaces modified with various SAMs were characterized by Ultra-violet photoelectron spectroscopy
(UPS).