(a) Structure of a PVDF-TrFE ferroelectric synaptic transistor. (b) Schematic biological synapse (left) and corresponding equivalent circuit of the FONT synapse (right). (c) PSC as a function of the number of pulses with different amplitudes and fixed width. (d) PSC as a function of the pulse width and number of pulses. (e) Images of conformable FONTs on brain-shaped PDMS mold and completely folded FONTs. (f) Implementation of symmetric and asymmetric STDP of the FONT synapse. Reprinted with permission from Ref. [44]. Copyright 2019, American Chemical Society. (g) 3D sketch of the design of an organic ferroelectric transistor synapse with a 2D MoS₂ channel. (h) Channel conductance as a function of gate voltage pulse amplitude. Reprinted with permission from Ref. [95]. Copyright 2019, John Wiley & Sons.