Influence of quantum dots shape approximation on size reconstructed from atomic force microscopy measurements

Piotrowski, T.; Sikorski, S.

doi:10.2478/s11772-008-0066-4

Cited by 4 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurements of the QD heights and diameters gave average values of 4.3±0.1 and 24±0.5 nm, henceforth the aspect ratio was about 0.18. Nevertheless, the resolution of AFM is limited by the sharpness and shape of the tip whose normal radius of curvature is 10-60 nm [20,21] and there is a lack of precision in AFM measurements of nanometer-sized samples in the lateral dimension [22]. In order to obtain trustworthy spatial measurements of QD diameters, cross sectional TEM images were taken along [110] zone axis at the sample surface.…”

Section: Resultsmentioning

confidence: 99%

General route for the decomposition of InAs quantum dots during the capping process

et al. 2016

View full text Add to dashboard Cite

The effect of the capping process on the morphology of InAs/GaAs quantum dots (QDs) by using different GaAs-based capping layers (CLs), ranging from strain reduction layers to strain compensating layers, has been studied by transmission microscopic techniques. For this, we have measured simultaneously the height and diameter in buried and uncapped QDs covering populations of hundreds of QDs that are statistically reliable. First, the uncapped QD population evolves in all cases from a pyramidal shape into a more homogenous distribution of buried QDs with a spherical-dome shape, despite the different mechanisms implicated in the QD capping. Second, the shape of the buried QDs depends only on the final QD size, where the radius of curvature is function of the base diameter independently of the CL composition and growth conditions. An asymmetric evolution of the QDs' morphology takes place, in which the QD height and base diameter are modified in the amount required to adopt a similar stable shape characterized by a averaged aspect ratio of 0.21. Our results contradict the traditional model of QD material redistribution from the apex to the base and point to a different universal behavior of the overgrowth processes in self-organized InAs QDs.

show abstract

Section: Resultsmentioning

confidence: 99%

General route for the decomposition of InAs quantum dots during the capping process

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Since AFM images are a convolution of the probe tip and the QD itself, the measured widths can be $8-10 nm larger than the actual diameters of the QDs. 25,26 To minimize tip-induced differences in comparing the island sizes and densities, all the samples in this study were scanned using the same AFM tip, and tip broadening was not observed after extensive scanning. It should be noted that the dimensions of the buried QDs will be different from those of the uncapped QDs that are presented here; unlike the surface QDs, buried QD dimensions are influenced by surface segregation of the In atoms and alloying of the InAs in the QD with the surrounding GaAs.…”

mentioning

confidence: 99%

Increased InAs quantum dot size and density using bismuth as a surfactant

Dasika

Krivoy

Nair

et al. 2014

Applied Physics Letters

View full text Add to dashboard Cite

show abstract

“…The tip was TESP SS type from Bruker, which has a radius of about 2 nm. After introduction correction of measured diameter (D), the height (h) of the measured object and the tip radius (R) [13] according to Eq. (1), the average diameter (d) was accepted as 28 nm.…”

Section: Particles Analysismentioning

confidence: 99%

Photochemical silver nanoparticles deposition on sol–gel TiO2 for plasmonic properties utilization

Starowicz

Lipiński

Socha

et al. 2014

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

This paper shows investigations on silver nanoparticles deposition using simple photochemical method on sol-gel coated titania. The influence of titania substrate, silver precursor concentration, light intensity and irradiation time are considered as a factors determining the microstructure. The average diameter of the particles and surface coverage are calculated from SEM microstructure investigations and confirmed by AFM imaging. The crystalline phase in titania layers were determined by TEM and Raman spectroscopy. The optical measurements of absorbance and absorption were shown indicating that there was no absorption of the light used in experiment even though deposition of nano silver was confirmed. Finally, the plasmonic properties were simulated for the model particles by finite difference time domain method. Possible application of obtained structure was proposed.

show abstract

Influence of quantum dots shape approximation on size reconstructed from atomic force microscopy measurements

Cited by 4 publications

References 9 publications

General route for the decomposition of InAs quantum dots during the capping process

General route for the decomposition of InAs quantum dots during the capping process

Increased InAs quantum dot size and density using bismuth as a surfactant

Photochemical silver nanoparticles deposition on sol–gel TiO2 for plasmonic properties utilization

Contact Info

Product

Resources

About