The disclosed technology generally relates to methods of fabricating a semiconductor device, and more particularly to methods of fabricating a ferroelectric field-effect transistor (FeFET). According to one aspect, a method of fabricating a FeFET includes forming a layer stack on a gate structure, wherein forming the layer stack comprises a ferroelectric layer followed by forming a sacrificial stressor layer. The method additionally includes heat-treating the layer stack to cause a phase transition in the ferroelectric layer. The method additionally includes, subsequent to the heat treatment, replacing the sacrificial stressor layer with a two-dimensional (2D) material channel layer. The method further includes forming a source contact and a drain contact contacting the 2D material channel layer.