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Air‐stable n‐type organic semiconductorswith high mobilities have been actively pursued since organic transistors have proven their importance in the development of low‐cost electronics. A promising candidate, fluorinated copper‐phthalocyanine, is investigated here. Electron transport properties are presented here for polycrystalline thin films and for single crystals of this compound, and it is reported that stable device performance in air can be achieved. The intrinsic transport mechanism is found to be band‐like charge transport. Effects of trapping and grain boundaries are also discussed.

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