Nature of the second optical transition in PbSe nanocrystals

被引：54

作者：

Trinh, M. Tuan ^{[1
]}

Houtepen, Arjan J. ^{[1
]}

Schins, Juleon M. ^{[1
]}

Piris, Jorge ^{[1
]}

Siebbeles, Laurens D. A. ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Sci Appl, NL-2628 BL Delft, Netherlands

来源：

NANO LETTERS | 2008年 / 8卷 / 07期

关键词：

D O I：

10.1021/nl8010963

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The second peak in the optical absorption spectrum of PbSe nanocrystals is arguably the most discussed optical transition in semiconductor nanocrystals. Ten years of scientific debate have produced many theoretical and experimental claims for the assignment of this feature as the 1P(e)1P(h) as well as the 1S(h,e)1P(e,h) transitions. We studied the nature of this absorption feature by pump-probe spectroscopy, exactly controlling the occupation of the states involved, and present conclusive evidence that the optical transition involves neither 1S(e) nor 1S(h) states. This suggests that it is the 1P(h)1P(e) transition that gives rise to the second peak in the absorption spectrum of PbSe nanocrystals.

引用

页码：2112 / 2117

页数：6

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