Surfaces of Infrared-Active PbS Nanocrystals and their Assemblies
William Tisdale a
a Massachusetts Institute of Technology (MIT), Department of Chemical Engineering, Green Bldg, Cambridge, MA 02142, EE. UU., Cambridge, United States
Proceedings of Internet Conference for Quantum Dots (iCQD)
Online, Spain, 2020 July 14th - 17th
Organizers: Quinten Akkerman, Raffaella Buonsanti, Zeger Hens and Maksym Kovalenko
Keynote, William Tisdale, presentation 031
Publication date: 3rd July 2020

PbS nanocrystals are among the most-studied infrared-active QD materials, with potential applications ranging from solar cells to IR LEDs to photon up/down conversion systems and thermoelectrics. Despite their rich history we continue to learn new things about PbS QD chemistry, photophysics, and self-organization into ordered solids. In this talk, I will highlight recent work from my lab at MIT on the structure of PbS QD surfaces. In particular, I will demonstrate neutron scattering as a powerful emerging tool for the characterization of colloidal QDs and the detailed information that small-angle neutron scattering (SANS) can provide about the ligand layers surrounding QDs. Additionally, I will demonstrate the underappreciated role of unbound – or “free” – ligand in mediating the structure of self-assembled QD superlattices.

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