Cobalt phthalocyanine-based submicrometric field-effect transistors

Phone: þ34 943 574012, Fax: 34 943 574001We present performance characteristics of nanoscaled cobaltphthalocyanine (CoPc)-based organic field-effect transistors(OFETs) as a function of channel length. We found a channellength range which maximizes the field effect mobility in atrade-off between the decrease in the number of organic grainboundaries and the increase of the electrode–organic contactregion. Further reduction of channel length is limited by fringecurrents, which lead to an increased off current and to adegradation of the sub-threshold slope. From this, we definean optimal channel length of 280nm to 1mm for applicationsin submicrometric CoPc-based OFETs. Our results are particu-larly relevant for the miniaturization of chemical sensingOFETs, where metal phthalocyanines have proven to beexcellentcandidatesforthefabricationofthetransistorchannel.