  Solution-processed two-dimensional (2D) materials hold promise for their
scalable applications. However, the random, fragmented nature of the
solution-processed nanoflakes and the poor percolative conduction through their
discrete networks limit the performance of the enabled devices. To overcome the
problem, we report conduction modulation of the solution-processed 2D materials
via the Stark effect. Using liquid-phase exfoliated molybdenum disulfide (MoS2)
as an example, we demonstrate nonlinear conduction modulation with a switching
ratio of >105 by the local fields from the interfacial ferroelectric
P(VDF-TrFE). Through density-functional theory calculations and in situ Raman
scattering and photoluminescence spectroscopic analysis, we understand the
modulation arises from a charge redistribution in the solution-processed MoS2.
Beyond MoS2, we show the modulation may be viable for the other
solution-processed 2D materials and low-dimensional materials. The effective
modulation can open their electronic device applications.
