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 J. Kramer, David Zhitomirsky, Sjoerd Hoogland, Edward H. Sargent

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

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.
Original languageEnglish (US)
JournalNature Communications
Volume6
Issue number1
DOIs
StatePublished - Jul 13 2015
Externally publishedYes

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