Organic Semiconductors have shown promise for their use in flexible and wide area electronics and biosensing devices. Studies of organic single crystals as semiconductors in Electrolyte Gated Transistors (EGTs) give insight into charge transport properties of organic semiconductors. Electrolyte gating creates an electrical double layer with high charge density at the electrolyte-semiconductor interface. As charge density increases in organic EGTs, carrier mobility decreases dramatically, resulting in a peak in conductivity. The use of surfactants in the electrolyte layer may diminish this mobility loss by increasing the distance between charges in the electrolyte and charge carriers in the semiconductor. The addition of Brij-58 surfactant to [P14][FAP] ionic liquid in a rubrene EGT alters the work function on the electrolyte-semiconductor or electrolyte-gate electrode interface, shifting the conductivity peak and threshold voltage (the gate voltage at which the device turns on) with minimal changes to peak conductivity, suggesting potential tunability of these important voltage levels.

Probing the conductivity peak of organic electrolyte gated transistors

251st National Meeting (2016)

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