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

Jae Hee Han, Geraldine L.C. Paulus, Ryuichiro Maruyama, Daniel A. Heller, Woo Jae Kim, Paul W. Barone, Chang Young Lee, Jong Hyun Choi, Moon Ho Ham, Changsik Song, C. Fantini, Michael S. Strano

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

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 coreg-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 (Eg=1.21 eV) and cores with bandgaps smaller than those of the shell (Eg=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.

Original languageEnglish
Pages (from-to)833-839
Number of pages7
JournalNature Materials
Volume9
Issue number10
DOIs
StatePublished - Oct 2010

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