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

M. H. Weber; K. G. Lynn; B. Barbiellini; P. A. Sterne; A. B. Denison

doi:10.1103/PhysRevB.66.041305

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

M. H. Weber, K. G. Lynn, B. Barbiellini, P. A. Sterne, and A. B. Denison

Phys. Rev. B 66, 041305(R) – Published 19 July 2002

Abstract

CdSe quantum dot samples with sizes in the range of $1.8 - \sim 6 nm$ 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.

Received 7 February 2002

DOI:https://doi.org/10.1103/PhysRevB.66.041305

Authors & Affiliations

M. H. Weber¹, K. G. Lynn^1,2, B. Barbiellini³, P. A. Sterne⁴, and A. B. Denison⁵

¹Department of Physics, Washington State University, Pullman, Washington 99164-2814
²Center for Materials Research, Washington State University, Pullman, Washington 99164-2711
³Northeastern University, Boston, Massachusetts 02115
⁴Lawrence Livermore National Laboratory, Livermore, California 94551
⁵Idaho National Engineering and Environmental Laboratory, Bechtel BWXT Idaho, LLC, P.O. Box 1625, Idaho Falls, Idaho 83415

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Vol. 66, Iss. 4 — 15 July 2002

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