Direct observation of energy-gap scaling law in CdSe quantum dots with positrons

被引：33

作者：

Weber, MH ^{[1
]}

Lynn, KG

Barbiellini, B

Sterne, PA

Denison, AB

机构：

[1] Washington State Univ, Dept Phys, Pullman, WA 99164 USA

[2] Washington State Univ, Mat Res Ctr, Pullman, WA 99164 USA

[3] Northeastern Univ, Boston, MA 02115 USA

[4] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[5] Bechtel BWXT Idaho LLC, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.66.041305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CdSe quantum dot samples with sizes in the range of 1.8-similar to6 nm in diameter were examined by positron annihilation spectroscopy. The results were compared to data obtained for single-crystal bulk CdSe. Evidence is provided that the positrons annihilate within the nanospheres. The annihilation line shape shows a smearing at the boundary of the Jones zone proportional to the widening of the band gap due to a reduction in the size of the quantum dots. The data confirm that the change in the band gap is inversely proportional to the square of the quantum dot diameter.

引用

页码：413051 / 413054

页数：4

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