Low-Temperature Band Transport and Impact of Contact Resistance in Organic Field-Effect Transistors Based on Single-Crystal Films of Ph-BTBT-C10

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Even as technology based on solution-processable organic semiconductors advances, questions remain about their charge transport. The hallmark of b00exa00exn00exd t00exr00exa00exn00exs00exp00exo00exr00ext is electron mobility that increases with decreasing temperature. Here transistors based on the polycyclic molecule Ph-BTBT-10, which crystallizes in domains that are hundreds of micrometers long, present mobility that is already high at room temperature and bandlike down to 80 K. This study demonstrates that four-probe measurements are essential to understanding intrinsic transport in these materials.