Stoichiometric control of the density of states in PbS colloidal quantum dot solids.

ABSTRACT: Colloidal quantum dots, and nanostructured semiconductors in general, carry the promise of overcoming the limitations of classical materials in chemical and physical properties and in processability. However, sufficient control of electronic properties, such as carrier concentration and carrier mobility, has not been achieved until now, limiting their application. In bulk semiconductors, modifications of electronic properties are obtained by alloying or doping, an approach that is not viable for structures in which the surface is dominant. The electronic properties of PbS colloidal quantum dot films are fine-tuned by adjusting their stoichiometry, using the large surface area of the nanoscale building blocks. We achieve an improvement of more than two orders of magnitude in the hole mobili

SUBMITTER: Balazs DM 

PROVIDER: S-EPMC5621976 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature