Spin-coated fluorinated PbS QD superlattice thin film with high hole mobility

Pan Xia, Daniel W. Davies, Bijal B. Patel, Maotong Qin, Zhiming Liang, Kenneth R. Graham, Ying Diao, Ming Lee Tang

Research output: Contribution to journalArticlepeer-review

Abstract

Motivated by the oleophobic and electron-withdrawing nature of perfluorocarbons, we explore the effect of a trifluoromethyl coating on lead sulfide quantum dots (PbS QDs) in thin film transistor (TFT) geometry. The low surface energy conferred by the oleophobic perfluorocarbons creates QDs packed in a primitive cubic lattice with long range order, as confirmed by grazing incidence small angle X-ray scattering (GISAXS) and transmission electron microscopy (TEM). Hole mobilities as high as 0.085 cm2 V-1 s-1 were measured in the TFTs. No electron transport was observed. This suggests that the electron-withdrawing nature of the trifluoromethyl ligand is eclipsed by the excess holes present in the PbS QDs that likely stem from cation vacancies induced by the thiol group.

Original languageEnglish (US)
Pages (from-to)11174-11181
Number of pages8
JournalNanoscale
Volume12
Issue number20
DOIs
StatePublished - May 28 2020

ASJC Scopus subject areas

  • Materials Science(all)

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