The use of thermally decomposable ligands for conductive films of semiconductor nanocrystals

Andrew W. Wills, Moon Sung Kang, Ankur Khare, Wayne Gladfelter, David Norris

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Poor conductivity is a bottleneck hindering the production of nanocrystal-based devices. In most nanocrystal syntheses, ligands with long alkyl chains are used to prepare monodisperse, crystalline particles. When these nanocrystals are incorporated into devices as films, the bulky ligands form an insulating layer that prevents charge transfer between particles. While annealing or post-deposition chemical treatments can be used to strip surface ligands, each of these approaches has disadvantages. Here we demonstrate the use of a novel family of ligands comprised of primary alkyl dithiocarbamates to stabilize PbSe/CdSe core-shell nanocrystals. Primary dithiocarbamates, which can bind to cadmium and lead, are known to decompose to the corresponding sulfides when heated under mild conditions. In our scheme, PbSe/CdSe core-shell nanocrystals are first synthesized with standard ligands. These ligands are then exchanged to short chain dithiocarbamates in solution. When a film is cast and annealed at low temperature, the dithiocarbamates are removed. Electron microscopy reveals that the particles move closer together, and, along with x-ray diffraction, shows that the nanocrystals remain quantum confined. Transport measurements show a 10,000-fold increase in conductivity after annealing.

Original languageEnglish (US)
Title of host publicationPhotovoltaics and Optoelectronics from Nanoparticles
PublisherMaterials Research Society
Pages137-142
Number of pages6
ISBN (Print)9781605112374
DOIs
StatePublished - Jan 1 2010

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1260
ISSN (Print)0272-9172

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    Wills, A. W., Kang, M. S., Khare, A., Gladfelter, W., & Norris, D. (2010). The use of thermally decomposable ligands for conductive films of semiconductor nanocrystals. In Photovoltaics and Optoelectronics from Nanoparticles (pp. 137-142). (Materials Research Society Symposium Proceedings; Vol. 1260). Materials Research Society. https://doi.org/10.1557/proc-1260-t12-03