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Regensburg 2019 – scientific programme

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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 Lange1,21Insitute 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

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