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Transient Absorption Spectroscopic Study on Band-Structure-Type Change in CdTe/CdS Core-Shell Quantum Dots

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8 Author(s)
Wang, Lei ; State Key Lab. for Integrated Optoelectron., Jilin Univ., Changchun, China ; Wang, Hai-Yu ; Bing-Rong Gao ; Ling-Yun Pan
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We report on the band edge alignment in zinc-blended-type CdTe/CdS core-shell quantum dots, using femtosecond spectroscopy. Time-resolved transient absorption spectroscopy directly shows that the system gradually developed from quasi-type-I to type-II as the shell thickness increased. Following photoexcitation of CdS, the injection of a hole from CdS valence band into CdTe valence band is observed. The hole transfer occurs on the 1000 fs time scale in these heteromaterials. Furthermore, a strain ca. 150 meV is obtained by comparing the transient with steady-state spectra.

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Quantum Electronics, IEEE Journal of  (Volume:47 ,  Issue: 9 )