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

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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.

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

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Supplementary files

Article information


Submitted
22 Mar 2020
Accepted
06 May 2020
First published
06 May 2020

Nanoscale, 2020, Advance Article
Article type
Paper

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

P. Xia, D. W. Davies, B. B. Patel, M. Qin, Z. Liang, K. R. Graham, Y. Diao and M. L. Tang, Nanoscale, 2020, Advance Article , DOI: 10.1039/D0NR02299C

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