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Ultrafast carrier dynamics in CuInS2 quantum dots

Sun, Jianhui ; Zhu, Dehua ; Zhao, Jialong ; Ikezawa, Michio ; Wang, Xiuying ; Masumoto, Yasuaki

Applied physics letters, 2014-01, Vol.104 (2) [Periódico revisado por pares]

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Título:
Ultrafast carrier dynamics in CuInS2 quantum dots
Autor: Sun, Jianhui ; Zhu, Dehua ; Zhao, Jialong ; Ikezawa, Michio ; Wang, Xiuying ; Masumoto, Yasuaki
Assuntos: Applied physics ; Bleaching ; Electrons ; Quantum dots ; Spectrum analysis ; Surface defects
É parte de: Applied physics letters, 2014-01, Vol.104 (2)
Descrição: The ultrafast carrier dynamics in CuInS2 (CIS) quantum dots (QDs) was studied by means of femtosecond transient absorption (TA) spectroscopy. The size-dependent 1S transition energy determined from bleaching spectra is in agreement with that calculated on the finite-depth-well model in the effective mass approximation. The TA bleaching comes from filling of electron quantized levels, allowing us to know the dynamics of the 1S electron in CIS QDs. The sub-100-ps electron trapping at surface defects in bare QDs accelerates with decreasing QD size, while is effectively suppressed in well-passivated CIS/ZnS core/shell QDs.
Editor: Melville: American Institute of Physics
Idioma: Inglês

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