Exciton antennas and concentrators from core-shell and corrugated carbon nanotube filaments of homogeneous composition.

Citation data:

Nature materials, ISSN: 1476-1122, Vol: 9, Issue: 10, Page: 833-9

Publication Year:
2010
Usage 321
Abstract Views 300
HTML Views 11
PDF Views 8
Link-outs 2
Captures 96
Readers 91
Exports-Saves 5
Social Media 1
Scores 1
Citations 49
Citation Indexes 49
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/12308
PMID:
20835232
DOI:
10.1038/nmat2832
Author(s):
Han, Jae-Hee, Paulus, Geraldine L. C., Maruyama, Ryuichiro, Heller, Daniel A., Kim, Woo-Jae, Barone, Paul W., Lee, Chang Young, Choi, Jong Hyun, Ham, Moon-Ho, Song, Changsik, Fantini, C., Strano, Michael S. Show More Hide
Publisher(s):
NATURE PUBLISHING GROUP
Tags:
Chemistry, Materials Science, Physics and Astronomy, Engineering, ENERGY-TRANSFER, OPTICAL ANTENNAS, BUNDLES, PHOTOLUMINESCENCE, DIFFUSION, DIAMETER, CHARGE
article description
There has been renewed interest in solar concentrators and optical antennas for improvements in photovoltaic energy harvesting and new optoelectronic devices. In this work, we dielectrophoretically assemble single-walled carbon nanotubes (SWNTs) of homogeneous composition into aligned filaments that can exchange excitation energy, concentrating it to the centre of core-shell structures with radial gradients in the optical bandgap. We find an unusually sharp, reversible decay in photoemission that occurs as such filaments are cycled from ambient temperature to only 357 K, attributed to the strongly temperature-dependent second-order Auger process. Core-shell structures consisting of annular shells of mostly (6,5) SWNTs (E(g)=1.21 eV) and cores with bandgaps smaller than those of the shell (E(g)=1.17 eV (7,5)-0.98 eV (8,7)) demonstrate the concentration concept: broadband absorption in the ultraviolet-near-infrared wavelength regime provides quasi-singular photoemission at the (8,7) SWNTs. This approach demonstrates the potential of specifically designed collections of nanotubes to manipulate and concentrate excitons in unique ways.