Analysis of size distributions of type II ZnTe/ZnSe quantum dots

Johnson Lee, Chu Shou Yang, Chun Tai Chang, Jerron Liu, Wu-Ching Chou*, Chih Ming Lai, Gwo Jen Jan, Yin Sheng Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The photoluminescence (PL) spectrum of the ZnTe/ZnSe quantum dot (QD) structure which has a type II band alignment was investigated. A broader structure peaking at 2.180 eV together with the features of the ZnSe buffer layer located at 2.820 eV in the PL spectrum at 10 K were observed. The broadness of the PL attributes to the spatial inhomogeneity of the QD sizes. The PL spectrum was a normal distribution with a variance of 0.002 eV 2. However, the dot size distribution was a deformed Gaussian. Using only one set of data of dot size distribution measured by the Atomic Force Microscopy (AFM), the statistical estimates with standard errors were evaluated using the bootstrap methodology. The probability distribution was inferred by calculating the means, percentiles and correlation coefficients of the base diameter and the height of the QDs. We concluded that the dot distributions were indeed a deformed Gaussian and the correlation coefficient of the diameter and the height of the QDs was 0.49 ± 0.01. The uniformity of the dot size distribution was poor. To infer the dot size distribution from the PL spectrum, we numerically solved the Schrödinger equation by elaborating on the orthogonal periodic functions (OPF) approximation for the type II lens shaped QDs. The convergence of the probability density was discussed in a great detail. We found that the band edge discontinuities inside the dot acts as a barrier with ΔEc = 315 meV for the conduction band and as a well with ΔEv = 735 meV for the valence band. In the AFM measurement, the offset in dot height is 14 Å and the aspect ratio is 0.04. We employed the Schrödinger equation to correlated the PL spectrum (intensity versus optical energy) to the AFM data (number of QDs versus dot size) and the agreement was excellent.

Original languageEnglish
Pages (from-to)3532-3543
Number of pages12
JournalPhysica Status Solidi (B) Basic Research
Volume241
Issue number15
DOIs
StatePublished - 1 Dec 2004

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    Lee, J., Yang, C. S., Chang, C. T., Liu, J., Chou, W-C., Lai, C. M., Jan, G. J., & Huang, Y. S. (2004). Analysis of size distributions of type II ZnTe/ZnSe quantum dots. Physica Status Solidi (B) Basic Research, 241(15), 3532-3543. https://doi.org/10.1002/pssb.200402106