Tailoring the Height of Ultrathin PbS Nanosheets and Their Application as Field‐Effect Transistors

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 micrometers 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 4 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.