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We observe bulk-like hole transport in amorphous organic semiconductors in a thin film transistor (TFT) configuration.Five different organic hole transporters (HTs) commonly used in organic light-emitting diodes are investigated.When these HTs are deposited on SiO2 gate dielectric layer, the TFT mobilities are 1-2 orders of magnitude smaller than those obtained from bulk films (3-8 lm) using time-of-flight (TOF) technique.