Single-step fabrication of quantum funnels via centrifugal colloidal casting of nanoparticle films

Jin Young Kim, Valerio Adinolfi, Brandon R. Sutherland, Oleksandr Voznyy, S. Joon Kwon, Tae Wu Kim, Jeongho Kim, Hyotcherl Ihee, Kyle Kemp, Michael Adachi, Mingjian Yuan, Illan Kramer, David Zhitomirsky, Sjoerd Hoogland and Edward H. Sargent ()
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Jin Young Kim: University of Toronto
Valerio Adinolfi: University of Toronto
Brandon R. Sutherland: University of Toronto
Oleksandr Voznyy: University of Toronto
S. Joon Kwon: Nanophotonics Research Center, Korea Institute of Science and Technology
Tae Wu Kim: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science
Jeongho Kim: Inha University
Hyotcherl Ihee: Center for Nanomaterials and Chemical Reactions, Institute for Basic Science
Kyle Kemp: University of Toronto
Michael Adachi: University of Toronto
Mingjian Yuan: University of Toronto
Illan Kramer: University of Toronto
David Zhitomirsky: University of Toronto
Sjoerd Hoogland: University of Toronto
Edward H. Sargent: University of Toronto

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Centrifugal casting of composites and ceramics has been widely employed to improve the mechanical and thermal properties of functional materials. This powerful method has yet to be deployed in the context of nanoparticles—yet size–effect tuning of quantum dots is among their most distinctive and application-relevant features. Here we report the first gradient nanoparticle films to be constructed in a single step. By creating a stable colloid of nanoparticles that are capped with electronic-conduction-compatible ligands we were able to leverage centrifugal casting for thin-films devices. This new method, termed centrifugal colloidal casting, is demonstrated to form films in a bandgap-ordered manner with efficient carrier funnelling towards the lowest energy layer. We constructed the first quantum-gradient photodiode to be formed in a single deposition step and, as a result of the gradient-enhanced electric field, experimentally measured the highest normalized detectivity of any colloidal quantum dot photodetector.

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8772

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DOI: 10.1038/ncomms8772

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