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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2015 ; 6 (ä): ä Nephropedia Template TP
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Single-step fabrication of quantum funnels via centrifugal colloidal casting of nanoparticle films #MMPMID26165185
Kim JY; Adinolfi V; Sutherland BR; Voznyy O; Kwon SJ; Kim TW; Kim J; Ihee H; Kemp K; Adachi M; Yuan M; Kramer I; Zhitomirsky D; Hoogland S; Sargent EH
Nat Commun 2015[]; 6 (ä): ä PMID26165185show ga
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.