Light harvesting and carrier transport in core/barrier/shell semiconductor nanocrystals

被引：54

作者：

Dias, Eva A. ^{[1
]}

Sewall, Samuel L. ^{[1
]}

Kambhampati, Patanjali ^{[1
]}

机构：

[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2K6, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 02期

关键词：

D O I：

10.1021/jp0658389

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Excitation transfer pathways in colloidal core/barrier/shell nanomaterials were investigated in the CdSe/ZnS/CdSe system. Absorption of light in the outer CdSe shell results in emission from the band edge of the CdSe core. The CdSe quantum shell acts as a light harvester that indirectly increases the brightness of the CdSe quantum-dot core. Spectroscopic evidence suggesting that the CdSe core and shell are coupled by tunneling of excitons through the ZnS barrier is provided. Competition kinetic analysis shows that charge transport competes effectively with hole capture by pyridine at the outer CdSe shell and exciton relaxation within the outer CdSe shell.

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收藏

页码：708 / 713

页数：6

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