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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 58: Nanostructures, Nanostructuring and Nanosized Soft Matter
CPP 58.6: Vortrag
Donnerstag, 4. April 2019, 16:45–17:00, H13
Dye-Sensitized Ternary Copper Chalcogenide Nanocrystals: Optoelectronic Properties, Air Stability and Photosensitivity — •Sonam Maiti1,2, Santanu Maiti2, Ali Hossain Khan3, Frank Schreiber2, and Marcus Scheele1 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Germany. — 2Institute of Applied Physics, University of Tubingen, Germany — 3Department of Chemistry, Ghent University, Belgium
Copper chalcogenide nanocrystals (NCs) exhibit a great potential for optoelectronic applications and efforts have been made to increase electronic coupling in thin films of these materials.1-2 We report on the effect of ligand exchange of Cu2-xSeyS1-y as well as Cu2-xSe nanocrystals (NCs) with the organic pi-system Cobalt β-tetraaminophthalocyanine (CoTAPc) and analyze changes in the structural, optical as well as electronic properties. A strong ligand interaction with the surface of the NCs is revealed by absorption and Raman spectroscopy. Grazing-incidence small-angle X-ray scattering studies show a significant contraction in the interparticle distance upon ligand exchange. For Cu2-xSe, this contraction has a negligible effect on electric transport, while for Cu2-xSeyS1-y the conductivity increases by eight orders of magnitude and results in metal-like temperature-dependent transport. With photocurrent measurements, we demonstrate high optical responsivities for Cu2-xSeyS1-y NCs and show the organic pi-system acts as an electronic linker and an optical sensitizer at the same time. 1. C. Coughlan et al, Chem Rev 2017, 117 (9), 5865-6109. 2. S. Maiti et al, JPCC 2018, 122 (41), 23720-23727.