The Influence of Doping on the Optoelectronic Properties of PbS Colloidal Quantum Dot Solids.

ABSTRACT: We report on an extensive spectroscopic investigation of the impact of substitutional doping on the optoelectronic properties of PbS colloidal quantum dot (CQD) solids. N-doping is provided by Bi incorporation during CQD synthesis as well as post-synthetically via cation exchange reactions. The spectroscopic data indicate a systematic quenching of the excitonic absorption and luminescence and the appearance of two dopant-induced contributions at lower energies to the CQD free exciton. Temperature-dependent photoluminescence indicates the presence of temperature-activated detrapping and trapping processes of photoexcitations for the films doped during and after synthesis, respectively. The data are consistent with a preferential incorporation of the dopants at the QDs surface in the case of

SUBMITTER: Papagiorgis P 

PROVIDER: S-EPMC4705463 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature