  Two-dimensional, solution-processable semiconductor materials are anticipated
to be used in low-cost electronic applications, such as transistors and solar
cells. Here, lead sulfide nanosheets with a lateral size of several microns are
synthesized and it is shown how their height can be tuned by the variation of
the ligand concentrations. As a consequence of the adjustability of the
nanosheets' height between 2 to more than 20 nm charge carriers are in
confinement, which has a decisive impact on their electronic properties. This
is demonstrated by their use as conduction channel in a field-effect
transistor. The experiments show that the performance in terms of current,
On/Off ratio, and sub-threshold swing is tunable over a large range.
