TY - GEN
T1 - Dynamics of excitons and trions in semiconducting carbon nanotubes
AU - Okano, Makoto
AU - Nishihara, Taishi
AU - Yamada, Yasuhiro
AU - Kanemitsu, Yoshihiko
PY - 2013/5/30
Y1 - 2013/5/30
N2 - We report the optical properties and exciton dynamics of undoped and hole-doped single-walled carbon nanotubes (SWCNTs). In the one-dimensional structures of SWCNTs, an electron and a hole form an exciton with a huge exciton binding energy. Stable excitons govern the optical responses of SWCNTs even at room temperature. With hole doping of SWCNTs, new peaks due to positive trions (positively charged excitons) appear below the E11 exciton peaks in the absorption and photoluminescence spectra. Trions are also stable at room temperature. Using femtosecond pump-probe transient absorption spectroscopy, we revealed that the exciton decay dynamics depends on the number of holes in SWCNTs. The exciton lifetime of hole-doped SWCNTs is much shorter than that of undoped SWCNTs. Fast decay components with lifetimes of a few picoseconds are attributed to trion formation and exciton-hole scattering in holedoped SWCNTs.
AB - We report the optical properties and exciton dynamics of undoped and hole-doped single-walled carbon nanotubes (SWCNTs). In the one-dimensional structures of SWCNTs, an electron and a hole form an exciton with a huge exciton binding energy. Stable excitons govern the optical responses of SWCNTs even at room temperature. With hole doping of SWCNTs, new peaks due to positive trions (positively charged excitons) appear below the E11 exciton peaks in the absorption and photoluminescence spectra. Trions are also stable at room temperature. Using femtosecond pump-probe transient absorption spectroscopy, we revealed that the exciton decay dynamics depends on the number of holes in SWCNTs. The exciton lifetime of hole-doped SWCNTs is much shorter than that of undoped SWCNTs. Fast decay components with lifetimes of a few picoseconds are attributed to trion formation and exciton-hole scattering in holedoped SWCNTs.
KW - Carbon nanotubes
KW - Charged excitons
KW - Excitons
KW - Quantized Auger recombination
KW - Transient absorption
UR - http://www.scopus.com/inward/record.url?scp=84878201180&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84878201180&partnerID=8YFLogxK
U2 - 10.1117/12.2003263
DO - 10.1117/12.2003263
M3 - Conference contribution
AN - SCOPUS:84878201180
SN - 9780819493927
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Ultrafast Phenomena and Nanophotonics XVII
T2 - Ultrafast Phenomena and Nanophotonics XVII
Y2 - 3 February 2013 through 6 February 2013
ER -