3 research outputs found
Insights into the Structure and Self-Assembly of Organic-Semiconductor/Quantum-Dot Blends
Funder: Cambridge Commonwealth European and International TrustAbstract: Controlling the dispersibility of crystalline inorganic quantum dots (QD) within organicâQD nanocomposite films is critical for a wide range of optoelectronic devices. A promising way to control nanoscale structure in these nanocomposites is via the use of appropriate organic ligands on the QD, which help to compatibilize them with the organic host, both electronically and structurally. Here, using combined smallâangle Xâray and neutron scattering, the authors demonstrate and quantify the incorporation of such a compatibilizing, electronically active, organic semiconductor ligand species into the native oleic acid ligand envelope of lead sulphide, QDs, and how this ligand loading may be easily controlled. Further more, in situ grazing incidence wide/small angle Xâray scattering demonstrate how QD ligand surface chemistry has a pronounced effect on the selfâassembly of the nanocomposite film in terms of both smallâmolecule crystallization and QD dispersion versus ordering/aggregation. The approach demonstrated here shows the important role which the degree of incorporation of an active ligand, closely related in chemical structure to the host smallâmolecule organic matrix, plays in both the selfâassembly of the QD and smallâmolecule components and in determining the final optoelectronic properties of the system