Fixed negative interface charges compromise organic ferroelectric field-effect transistors

► Fabrication of low-switching-voltage organic ferroelectric field effect transistors. ► Two orders of magnitude difference in ID between on and off states at VG = 0 V. ► C-V measurements confirm stability of ferroelectric polarization in depletion. ► Apparent loss of polarization due to neutralization by negative interface charge. ► Negative charges migrate through the ferroelectric when transistor in accumulation.