title: Tailoring the height of ultrathin PbS nanosheets and their application as field-effect transistors.
abstract: 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.
authors.affiliation: Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146, Hamburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Bielewicz
authors.forename: Sedat
authors.initials: S
authors.lastname: Dogan
authors.forename: Christian
authors.initials: C
authors.lastname: Klinke
keywords: colloidal nanostructures; colloidal synthesis; electron transport; lead sulfide; transistors; two-dimensional materials