Spectroscopy and Femtosecond Dynamics of Type-II CdTe/CdSe Core–Shell Quantum Dots (pages 222–228)
Pi-Tai Chou, Chun-Yen Chen, Chiu-Ting Cheng, Shih-Chieh Pu, Kun-Chan Wu, Yi-Ming Cheng, Chih-Wei Lai, Yi-Hsuan Chou and Hsin-Tien Chiu
Version of Record online: 11 JAN 2006 | DOI: 10.1002/cphc.200500307
Femtosecond dynamics of CdTe/CdSe type-II quantum dots are studied. The results indicate that the electron-separation rate decreases as the size of the cores increases (see picture) and the finite rate of charge separation is tentatively ascribed to the low electron–phonon coupling. The degree of control on the rate of electron transfer may be crucial in applications where rapid carrier separation, followed by charge transfer into a matrix or electrode, is important.