Kim, Jin Young Adinolfi, Valerio Sutherland, Brandon R. Voznyy, Oleksandr Kwon, S. Joon Kim, Tae Wu Kim, Jeongho Ihee, Hyotcherl Kemp, Kyle Adachi, Michael Yuan, Mingjian Kramer, Illan Zhitomirsky, David Hoogland, Sjoerd Sargent, Edward H. 2024-01-20T06:34:41Z 2024-01-20T06:34:41Z 2021-09-04 2015-07 2041-1723 https://pubs.kist.re.kr/handle/201004/125303 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. English NATURE PUBLISHING GROUP FUNCTIONALLY GRADED MATERIALS METAL-MATRIX COMPOSITES NANOCRYSTALS GRADIENT Single-step fabrication of quantum funnels via centrifugal colloidal casting of nanoparticle films Article 10.1038/ncomms8772 1 NATURE COMMUNICATIONS, v.6 NATURE COMMUNICATIONS 6 scie scopus 000358859700009 2-s2.0-84978745376 Multidisciplinary Sciences Science & Technology - Other Topics Article FUNCTIONALLY GRADED MATERIALS METAL-MATRIX COMPOSITES NANOCRYSTALS GRADIENT