Development of electrochemical ATR ultraviolet-visible spectroscopy and its application to ionic liquid/organic semiconductor interfances

Abstract

Electric double-layer organic field-effect transistors (EDL-OFETs) have attracted much attention because of their significantly low operation voltage (<1 V) compared to conventional SiO₂-gated OFETs (>10 V). In EDL-OFETs, a high electric field is generated in the EDL that accumulates in the interfacial region between the organic semiconductor and electrolyte, resulting in a low operation voltage. Therefore, the organic semiconductor/electrolyte interface is especially important. In this study, we investigated this interfacial area by using new electrochemical ATR ultraviolet-visible spectroscopy.