Ultrafast electron transfer dynamics in CdSe/CdTe donor-acceptor nanorods

Photoinduced charge transfer dynamics in type-II CdSe/CdTe donor-acceptor nanorods were studied in real-time using femtosecond broadband pump-probe spectroscopy. Following photoexcitation of CdTe (lambda(ex) 620 nm), spectral bleaching from the state-filling signals of the band-edge optical transitions was measured using a femtosecond white light pulse (lambda(probe) = 350-750 nm). Excitation of the lowest energy CdTe transition shows an ultrafast change in the bleaching signals of both the CdTe and CdSe lowest energy IS transitions as well as the characteristic carrier transfer band. Our results indicate that interfacial interconduction band electron transfer CdTe to CdSe occurs on the 500 A time scale in these heteromaterials.