Loading...
Exciton diffusion in semiconducting single-walled carbon nanotubes studied by transient absorption microscopy
Ruzicka, Brian Andrew Wang, Rui Lohrman, Jessica Ren, Shenqiang Zhao, Hui
Ruzicka, Brian Andrew
Wang, Rui
Lohrman, Jessica
Ren, Shenqiang
Zhao, Hui
Citations
Altmetric:
Abstract
Spatiotemporal dynamics of excitons in isolated semiconducting single-walled carbon nanotubes are studied using transient absorption microscopy. Differential reflection and transmission of an 810-nm probe pulse after excitation by a 750-nm pump pulse are measured. We observe a biexponentially decaying signal with a fast time constant of 0.66 ps and a slower time constant of 2.8 ps. Both constants are independent of the pump fluence. By spatially and temporally resolving the differential reflection, we are able to observe a diffusion of excitons, and measure a diffusion coefficient of 200±10 cm2/s at room temperature and 300±10 cm2/s at lower temperatures of 10 K and 150 K.
Description
This is the publisher's version, also available electronically from http://journals.aps.org/prb/abstract/10.1103/PhysRevB.86.205417.
Date
2012-11-09
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Collections
Files
Research Projects
Organizational Units
Journal Issue
Keywords
Citation
Ruzicka, Brian A. et al. (2012). "Exciton diffusion in semiconducting single-walled carbon nanotubes studied by transient absorption microscopy." Physical Review B, 86(20)205417. http://dx.doi.org/10.1103/PhysRevB.86.205417