期刊
NANO LETTERS
卷 11, 期 7, 页码 2655-2659出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200679n
关键词
Supramolecular chemistry; j-aggregate; nanocrystal; light harvesting; optoelectronic device; photodetector
类别
资金
- National Science Foundation
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0001088]
- Institute for Soldier Nanotechnologies [W911NF-07-D-0004]
- DOE Basic Energy Sciences [DE-FG02-07ER46454]
- NSF-NSEC [PHY-0646094]
- Chesonis Family Foundation
- NSF-MRSEC [DMR-0819762]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [819762] Funding Source: National Science Foundation
J-aggregates are ordered dusters of coherently coupled molecular dyes,(1) and they have been used as light sensitizers in film photography due to their intense absorptions. Hybrid structures containing J-aggregates may also have applications in devices that require spectral specificity, such as color imaging or optical signaling.(2) However the use of J-aggregates in optoelectronic devices has posed a long-standing challenge(3,4) due to the difficulty of controlling aggregate formation and the low charge carrier mobility of many J-aggregates in solid state. In this paper, we demonstrate a modular method to assemble three different cyanine J-aggregates onto CdSe nanowires, resulting in a photodetector that is color-sensitized in three specific, narrow absorption bands. Both the J-aggregate and nanowire device components are fabricated from solution and the sensitizing wavelength is switched from blue to red to green, using only solution-phase exchange of the J-aggregates on the same underlying device.
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