Regensburg 2019 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 22: Quantum dots and wires: Transport properties
HL 22.2: Talk
Tuesday, April 2, 2019, 14:15–14:30, H34
Carrier Dynamics in CuInSe2 QD Solids studied by THz Spectrocopy — •Michael Deffner1,2, Friederieke Gorris1, Shekhar Priyadarshi1, Christian Klinke3, Horst Weller1,2, and Holger Lange1,2 — 1Insitute for Physical Chemistry, University Hamburg, Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 3Department of Chemistry, Swansea University, United Kingdom
CuInSe2 (CIS) is a cheap, low toxic and stable material to be used as an absorber in solar cells. It has a high absorption coefficient and a tunable optical bandgap 1.
Here, the transport properties of quantum dot (QD) films prepared with colloidal CuInSe2 QDs are studied using optical-pump-terahertz-probe. Using post-synthesized ligand exchange, the transport properties can be increased significantly and the low conductance of this QD solid can be overcome.
Our studies confirm the results of traditional four-point or FET-based measurements and show a much higher carrier mobility after photo-excitation for QD films with specific bridging ligands. Nevertheless, the responses of the films are distinctly different for different ligands and will be discussed in this talk.
1 Nano Lett. 2008, 8, 9, 2982-2987