Pentacene disproportionation during sublimation for field-effect transistors.


At moderate temperatures in flowing gas, pentacene undergoes a disproportionation reaction to produce 6,13-dihydropentacene (DHP) and a series of polycondensed aromatic hydrocarbons, including the previously unknown peripentacene (PP). The process requires activation by heating to 320 degrees C and is possibly catalyzed by impurities such as DHP, 6,13-pentacenequinone (PQ), Al, or Fe found in the starting materials. These impurities also result in a decrease in the intrinsic field-effect mobility (FEM) of pentacene crystals. Subsequent purifications remove such impurities, thus inhibiting the formation of the disproportionation products and increasing the FEM of pentacene (2.2 cm(2)/Vs). These results clarify the importance of purification of semiconductive materials for measurements of intrinsic mobility and optimal device performance.

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@article{Roberson2005PentaceneDD, title={Pentacene disproportionation during sublimation for field-effect transistors.}, author={Luke B. Roberson and Janusz Kowalik and Laren M. Tolbert and Christian Kloc and Roswitha Zeis and Xiaoliu Chi and Richard C Fleming and Charles L. Wilkins}, journal={Journal of the American Chemical Society}, year={2005}, volume={127 9}, pages={3069-75} }