Selective optical switching of interface-coupled relaxation dynamics in carbon nanotube-Si heterojunctions
Del Gobbo, Silvano
Scarselli, Manuela A.
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AbstractBy properly tuning the photon energy of a femtosecond laser pump, we disentangle, in carbon nanotube-Si (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.
SponsorsS.Pa., L.S., and S.P. thank the MIUR for supporting this work under Contract PRIN 2010BNZ3F2. S.Pa. acknowledges partial support from D.2.2 grants of the UCSC.
PublisherAmerican Chemical Society (ACS)