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We fabricated flexible n ‐type carbon nanotube thin‐film transistors on a plastic film by a simple transfer process and a solution‐based chemical doping technique with polyethyleneimine (PEI). There exists an optimal PEI concentration, which is determined by doping level and charge accumulation in the PEI layer. A high electron mobility of 70 cm2/Vs was achieved with an on/off ratio of 105 in ambient...
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