Anomalous band gap evolution from band inversion in Pb 1-xSn xTe nanocrystals

Indika U. Arachchige; Mercouri G. Kanatzidis

doi:10.1021/nl8037757

Anomalous band gap evolution from band inversion in Pb _1-xSn _xTe nanocrystals

Indika U. Arachchige, Mercouri G. Kanatzidis

Chemistry

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

We report the synthesis of a series of narrowly disperse Pb _1-xSn _xTe nanocrystals by employing a colloidal synthetic strategy. As synthesized nanocrystals are solid solutions with cubic NaCI-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 × = 0.67.

Original language	English (US)
Pages (from-to)	1583-1587
Number of pages	5
Journal	Nano letters
Volume	9
Issue number	4
DOIs	https://doi.org/10.1021/nl8037757
State	Published - Apr 8 2009

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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abstract = "We report the synthesis of a series of narrowly disperse Pb 1-xSn xTe nanocrystals by employing a colloidal synthetic strategy. As synthesized nanocrystals are solid solutions with cubic NaCI-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 × = 0.67.",

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AB - We report the synthesis of a series of narrowly disperse Pb 1-xSn xTe nanocrystals by employing a colloidal synthetic strategy. As synthesized nanocrystals are solid solutions with cubic NaCI-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 × = 0.67.

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Anomalous band gap evolution from band inversion in Pb _1-xSn _xTe nanocrystals

Abstract

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