N‐Heterocyclic‐Carbene‐Treated Gold Surfaces in Pentacene Organic Field‐Effect Transistors: Improved Stability and Contact at the Interface

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Abstract
N‐Heterocyclic carbenes (NHCs), which react with the surface of Au electrodes, have been successfully applied in pentacene transistors. With the application of NHCs, the charge‐carrier mobility of pentacene transistors increased by five times, while the contact resistance at the pentacene–Au interface was reduced by 85 %. Even after annealing the NHC–Au electrodes at 200 °C for 2 h before pentacene deposition, the charge‐carrier mobility of the pentacene transistors did not decrease. The distinguished performance makes NHCs as excellent alternatives to thiols as metal modifiers for the application in organic field‐effect transistors (OFETs).
Funding Information
  • Alexander von Humboldt-Stiftung
  • Deutsche Forschungsgemeinschaft (SFB 858 and Leibniz Award)
  • National Natural Science Foundation of China (91227201, 21527805, 21661132006)
  • Deutsche Forschungsgemeinschaft (SFB 858)

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