Mathematics and ... 2016MA16-005

Modeling and Design of Epitaxially Strained Nanoislands

Modeling and Design of Epitaxially Strained Nanoislands
Principal Investigator:
Co-Principal Investigator(s):
Ulrike Diebold (Vienna University of Technology)
Completed (01.07.2017 – 31.05.2021)
Funding volume:
€ 596,200

When island nanostructures self-assemble during the epitaxial growth of thin films on substrates, the resulting morphology strongly impacts thin-film physical and chemical properties. This triggers enormous interest in engineering pre-determined island shapes in order to improve the design of thin-film nanostructures employed in an ever-growing number of applications, such as optoelectronics, semiconductor devices, solid oxide fuel/hydrolysis cells, and photovoltaic devices. Completely reliable models are often missing, however. This project combines theoretical and experimental efforts to model the fundamental mechanisms responsible for the variety of nanoisland shapes. The validity of atomistic models introduced in Molecular Mechanics and of elastic models based on Continuum Mechanics will be assessed, and novel models proposed. The focus is on mono- and multilayer islands and on the roughness of thin films grown by Molecular Beam Epitaxy (MBE) and Pulsed Laser Deposition (PLD). The innovative aspects of the strategy reside on the forefront methods employed both in the mathematical and experimental investigations, and on the synergy between the two complementary approaches. Island shapes will be analytically recovered through the minimization of configurational energies in the Calculus of Variations framework, and experimental growth morphologies will be evaluated with a host of surface characterization techniques (STM, RHEED, AFM, LEIS, XPS, etc.).

Funded with financial means of WWTF, berndorf Privatstiftung and the City of Vienna.

Scientific disciplines: Mathematical physics (55%) | Materials physics (45%)

We use cookies on our website. Some of them are technically necessary, while others help us to improve this website or provide additional functionalities. Further information