Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/1035
Title: Stranski-Krastanow islanding initiated on the stochastic rough surfaces of the epitaxially strained thin films
Authors: Oğurtanı, Ömer Tarık
Çelik, Aytaç
Ören, Ersin Emre
Keywords: substrate
stress
stability
thermodynamics
evolution
growth
quantum dots
electromigration forces
morphological instability
free solid films
Issue Date: Jun-2014
Publisher: Amer Inst Physics
Source: Tarik Ogurtani, O., Celik, A., & Emre Oren, E. (2014). Stranski-Krastanow islanding initiated on the stochastic rough surfaces of the epitaxially strained thin films. Journal of Applied Physics, 115(22), 224307.
Abstract: Quantum dots (QD) have discrete energy spectrum, which can be adjusted over a wide range by tuning composition, density, size, lattice strain, and morphology. These features make quantum dots attractive for the design and fabrication of novel electronic, magnetic and photonic devices and other functional materials used in cutting-edge applications. The formation of QD on epitaxially strained thin film surfaces, known as Stranski-Krastanow (SK) islands, has attracted great attention due to their unique electronic properties. Here, we present a systematic dynamical simulation study for the spontaneous evolution of the SK islands on the stochastically rough surfaces (nucleationless growth). During the development of SK islands through the mass accumulation at randomly selected regions of the film via surface drift-diffusion (induced by the capillary and mismatch stresses) with and/or without growth, one also observes the formation of an extremely thin wetting layer having a thickness of a few Angstroms. Above a certain threshold level of the mismatch strain and/or the size of the patch, the formation of multiple islands separated by shallow wetting layers is also observed as metastable states such as doublets even multiplets. These islands are converted into a distinct SK islands after long annealing times by coalescence through the long range surface diffusion. Extensive computer simulation studies demonstrated that after an initial transient regime, there is a strong quadratic relationship between the height of the SK singlet and the intensity of the lattice mismatch strain (in a wide range of stresses up to 8.5GPa for germanium thin crystalline films), with the exception at those critical points where the morphological (shape change with necking) transition takes place. (C) 2014 AIP Publishing LLC.
URI: https://doi.org/10.1063/1.4883295
https://hdl.handle.net/20.500.11851/1035
ISSN: 0021-8979
Appears in Collections:Biyomedikal Mühendisliği Bölümü / Department of Biomedical Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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