Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots

	Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots
	Sun, J. H.; M. Ikezawa; X. Y. Wang; P. T. Jing; H. B. Li; J. L. Zhao and Y. Masumoto
	2015
发表期刊	Physical Chemistry Chemical Physics
卷号	17 期号:18 页码:11981-11989
摘要	Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots (CIS QDs) was studied by means of femtosecond transient-absorption (TA) and nanosecond time-resolved photoluminescence (PL) spectroscopy. Under strong excitation, the TA dynamics in CIS QDs is well described by a simple rate equation including single-carrier trapping, free-to-bound recombination, and trap-assisted Auger recombination. Under weak excitation, on the other hand, the PL decays of the QDs are composed of a short-lived component caused by surface trapping and a long-lived one caused by free-to-bound recombination. It is found that the surface trapping accelerates markedly with decreasing QD size while the free-to-bound radiative recombination hardly depends on the QD size. Besides this, we observed both a decrease in the PL lifetimes and a dynamic spectral redshift, which are attributed to the surface trapping and the coexistent inhomogeneous broadening in CIS QDs. The spectral redshift becomes less pronounced in CIS/ZnS core/shell QDs because of the suppression of the fast nonradiative recombination caused by the passivation of the surface traps. These results give clear evidence that the free-to-bound model is appropriate for interpreting the optical properties of CIS QDs.
收录类别	SCI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55412
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Sun, J. H.,M. Ikezawa,X. Y. Wang,et al. Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots[J]. Physical Chemistry Chemical Physics,2015,17(18):11981-11989.
APA	Sun, J. H.,M. Ikezawa,X. Y. Wang,P. T. Jing,H. B. Li,&J. L. Zhao and Y. Masumoto.(2015).Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots.Physical Chemistry Chemical Physics,17(18),11981-11989.
MLA	Sun, J. H.,et al."Photocarrier recombination dynamics in ternary chalcogenide CuInS2 quantum dots".Physical Chemistry Chemical Physics 17.18(2015):11981-11989.

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