Anomalous Band Gap Evolution from Band Inversion in Pb1-xSnxTe Nanocrystals

被引：68

作者：

Arachchige, Indika U. ^{[1
]}

Kanatzidis, Mercouri G. ^{[1
,2
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 04期

关键词：

QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; OPTICAL-ABSORPTION; HG1-XCDXTE; CLUSTERS;

D O I：

10.1021/nl8037757

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis of a series of narrowly disperse Pb1-xSnxTe nanocrystals by employing a colloidal synthetic strategy. As synthesized nanocrystals are solid solutions with cubic NaCl-type structure and exhibit band energy gaps in the mid-IR region. We show that these ternary nanocrystals display qualitatively the same anomalous trend in band gaps as a function of x that is attributed to the band inversion phenomenon of the corresponding bulk materials; however unlike the bulk the band gap does not vanish at any Sn concentration but achieves a minimum of 0.28 eV for x = 0.67.

引用

页码：1583 / 1587

页数：5

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