High-speed colloidal quantum dot photodiodes via accelerating charge separation at metal-oxide interface

Title
High-speed colloidal quantum dot photodiodes via accelerating charge separation at metal-oxide interface
Authors
한일기박준서황도경차순규정신영김지훈주병권강성준
Keywords
quantum dots; photodiodes; high-speed; charge separation
Issue Date
2019-03
Publisher
Small
Citation
VOL 15, NO 13-1900008-9
Abstract
With ever‐ growing technological demands in the imaging sensor industry for autonomous driving and augmented reality, developing sensors that can satisfy not only image resolution but also the response speed becomes more challenging. Herein, the focus is on developing a high‐ speed photosensor capable of obtaining high‐ resolution, high‐ speed imaging with colloidal quantum dots (QDs) as the photosensitive material. In detail, high‐ speed QD photodiodes are demonstrated with rising and falling times of τr = 28.8 ± 8.34 ns and τf = 40 ± 9.81 ns, respectively, realized by fast separation of electron– hole pairs due to the action of internal electric field at the QD interface, mainly by the interaction between metal oxide and the QD's ligands. Such energy transfer relations are analyzed and interpreted with time‐ resolved photoluminescence measurements, providing physical understanding of the device and working principles.
URI
http://pubs.kist.re.kr/handle/201004/69649
ISSN
1613-6810
Appears in Collections:
KIST Publication > Article
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