Carrier Multiplication in CdTe Quantum Dots by Single-photon Timing Spectroscopy

被引：51

作者：

Kobayashi, Yoichi ^{[1
]}

Udagawa, Takeshi ^{[1
]}

Tamai, Naoto ^{[1
]}

机构：

[1] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Chem, Sanda 6691537, Japan

来源：

CHEMISTRY LETTERS | 2009年 / 38卷 / 08期

关键词：

MULTIPLE EXCITON GENERATION; PBSE; NANOCRYSTALS; EFFICIENCY; TIME;

D O I：

10.1246/cl.2009.830

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Carrier multiplication (CM) was observed in CdTe quantum dots (QDs) capped with tetradecylphosphonic acid (TDPA) at h nu/E-g > 2.5 by picosecond single-photon timing spectroscopy, where h nu and E-g are the excitation and the band gap energies, and the CM efficiency increased rapidly with the increase of h nu/E-g. No CM was observed less than the threshold value of h nu/E-g approximate to 2.5, which is close to that of CdSe QDs. As compared to a previous report by Nair and Bawendi, our result suggests that CM is sensitive to the QD surface conditions.

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收藏

页码：830 / 831

页数：2

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