By properly tuning the photon energy of a femtosecond laser pump, we disentangle, in carbon nanotubeSi (CNT/Si) heterojunctions, the fast relaxation dynamics occurring in CNT from the slow repopulation dynamics due to hole charge transfer at the junction. In this way we are able to track the transfer of the photogenerated holes from the Si depletion layer to the CNT layer, under the action of the built-in heterojunction potential. This also clarifies that CNT play an active role in the junction and do not act only as channels for charge collection and transport.
Ponzoni, S., Galimberti, G., Sangaletti, L. E., Castrucci, P., Del Gobbo, S., Morbidoni, M., Scarselli, M., Pagliara, S., Selective Optical Switching of Interface-Coupled Relaxation Dynamics in Carbon Nanotube-Si Heterojunctions, <<JOURNAL OF PHYSICAL CHEMISTRY. C.>>, 2014; 118 (41): 24110-24116. [doi:10.1021/jp506684b] [http://hdl.handle.net/10807/68533]
Selective Optical Switching of Interface-Coupled Relaxation Dynamics in Carbon Nanotube-Si Heterojunctions
Ponzoni, Stefano;Galimberti, Gianluca;Sangaletti, Luigi Ermenegildo;Pagliara, Stefania
2014
Abstract
By properly tuning the photon energy of a femtosecond laser pump, we disentangle, in carbon nanotubeSi (CNT/Si) heterojunctions, the fast relaxation dynamics occurring in CNT from the slow repopulation dynamics due to hole charge transfer at the junction. In this way we are able to track the transfer of the photogenerated holes from the Si depletion layer to the CNT layer, under the action of the built-in heterojunction potential. This also clarifies that CNT play an active role in the junction and do not act only as channels for charge collection and transport.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
