Karsu Kilic - Academia.edu (original) (raw)

Papers by Karsu Kilic

2022 IEEE International Interconnect Technology Conference (IITC)

ACS Applied Materials & Interfaces

Advanced Functional Materials, 2019

Hyperconnected hybrid organosilicate glass networks formed by hyperstiff precursor molecules with... more Hyperconnected hybrid organosilicate glass networks formed by hyperstiff precursor molecules with certain geometrical characteristics can lead to exceptional elastic properties superior to that of fully dense silica. Carbonand silicon-containing precursors with defined molecular planarity are introduced and a new design strategy where both the network connectivity and the precursor geometry are effectively utilized to enhance elastic properties is proposed. The geometrical features rendering a precursor molecule as hyperstiff are identified through molecular dynamics simulations and constraint analyses by calculating the degree of nonaffine deformations. Nonaffine deformations have not been previously examined for organosilicate hybrid glass networks and are a fundamental new approach to reveal the combined impact of precursor geometry and connectivity on the mechanical behavior of hybrid glass networks.

Tribology International, 2016

Macroscopic frictional response of soft interfaces is strongly governed by the interaction of sur... more Macroscopic frictional response of soft interfaces is strongly governed by the interaction of surface heterogeneities such as micro-texture features with bulk heterogeneities such as voids or inclusions beneath the highly deformable surface. This microscopic interaction manifests itself on the macroscale as an interface response that is reminiscent of stick-slip. Consequently, the accompanying macroscopic friction signal exhibits strong oscillations around a mean value, which itself significantly differs from its microscopic value due to finite deformations. In this work, a mechanism is proposed which enables the tuning of the macroscopic friction signal of soft interfaces. Specifically, it is demonstrated that optimally positioning subsurface particles in the vicinity of micro-texture features can significantly reduce observed oscillations, thereby allowing control of macroscopic sliding friction.

Journal of Vacuum Science & Technology B, 2020

Paper published as part of the special topic on Reliability and Stress-related Phenomena in Nano ... more Paper published as part of the special topic on Reliability and Stress-related Phenomena in Nano and Microelectronics RSP2020 ARTICLES YOU MAY BE INTERESTED IN Fabrication of free-standing silicon carbide on silicon microstructures via massive silicon sublimation

The three-dimensional configurational arrangement of natural and synthetic network materials dete... more The three-dimensional configurational arrangement of natural and synthetic network materials determines their application range. Control of the real time incorporation of each building block, hence, all functional groups is desired so that we can regulate macroscopic properties from the molecular level onwards. Here we interconnect kinetic Monte Carlo simulations from the field of chemical kinetics and molecular dynamic simulations from the field of physics. We visualize for (in)organic network material synthesis how the initial building blocks interact timewise and spatially, accounting for variations in inter-and intramolecular chemical reactivity, diffusivity, segmental compositions, branch/network point locations, and defects. We use the kinetic and three-dimensional structural information to construct structure-property relationships based on molecular descriptors such as the molecular pore size or dangling chain distribution, differentiating between ideal and non-ideal structural elements. The generic nature is illustrated by constructing such relationships for the synthesis of organosilica, epoxy-amine and Diels-Alder based networks.

2020 IEEE International Interconnect Technology Conference (IITC)

We show that hyperconnected ULK dielectric glasses incorporating optimal precursor geometries lea... more We show that hyperconnected ULK dielectric glasses incorporating optimal precursor geometries lead to exceptional mechanical stiffness, as well as increasing fracture bond density. Using molecular dynamics and a novel graph theory approach, we predict that hyperconnected precursors with cyclic planar geometries significantly improve the mechanical reliability of these otherwise fragile materials, by not only increasing the network stiffness but also contributing to the fracture energy. Ultimately, we conclude that characterizing the implications of structural elements, such as precursor geometry and network connectivity, on the mechanical and fracture properties is essential for mechanically much more reliable design and integration of ULK dielectric materials.

We show that there is a strong relation between the bulk modulus and elastic deformation characte... more We show that there is a strong relation between the bulk modulus and elastic deformation characteristics of ULK organosilicate glasses. Our results indicate that the degree of deviation from homogeneous translation of the simulation cell deformation to molecular level is related to the constraints imposed by the precursor geometry and mean network connectivity of the structure. Characterization of this relation for a range of hybrid glasses that have different precursor geometries and network connectivity values is an important step towards establishing a robust molecular level design criteria to achieve desired mechanical properties of ULK glass materials.

2022 IEEE International Interconnect Technology Conference (IITC)

ACS Applied Materials & Interfaces

Advanced Functional Materials, 2019

Hyperconnected hybrid organosilicate glass networks formed by hyperstiff precursor molecules with... more Hyperconnected hybrid organosilicate glass networks formed by hyperstiff precursor molecules with certain geometrical characteristics can lead to exceptional elastic properties superior to that of fully dense silica. Carbonand silicon-containing precursors with defined molecular planarity are introduced and a new design strategy where both the network connectivity and the precursor geometry are effectively utilized to enhance elastic properties is proposed. The geometrical features rendering a precursor molecule as hyperstiff are identified through molecular dynamics simulations and constraint analyses by calculating the degree of nonaffine deformations. Nonaffine deformations have not been previously examined for organosilicate hybrid glass networks and are a fundamental new approach to reveal the combined impact of precursor geometry and connectivity on the mechanical behavior of hybrid glass networks.

Tribology International, 2016

Macroscopic frictional response of soft interfaces is strongly governed by the interaction of sur... more Macroscopic frictional response of soft interfaces is strongly governed by the interaction of surface heterogeneities such as micro-texture features with bulk heterogeneities such as voids or inclusions beneath the highly deformable surface. This microscopic interaction manifests itself on the macroscale as an interface response that is reminiscent of stick-slip. Consequently, the accompanying macroscopic friction signal exhibits strong oscillations around a mean value, which itself significantly differs from its microscopic value due to finite deformations. In this work, a mechanism is proposed which enables the tuning of the macroscopic friction signal of soft interfaces. Specifically, it is demonstrated that optimally positioning subsurface particles in the vicinity of micro-texture features can significantly reduce observed oscillations, thereby allowing control of macroscopic sliding friction.

Journal of Vacuum Science & Technology B, 2020

Paper published as part of the special topic on Reliability and Stress-related Phenomena in Nano ... more Paper published as part of the special topic on Reliability and Stress-related Phenomena in Nano and Microelectronics RSP2020 ARTICLES YOU MAY BE INTERESTED IN Fabrication of free-standing silicon carbide on silicon microstructures via massive silicon sublimation

The three-dimensional configurational arrangement of natural and synthetic network materials dete... more The three-dimensional configurational arrangement of natural and synthetic network materials determines their application range. Control of the real time incorporation of each building block, hence, all functional groups is desired so that we can regulate macroscopic properties from the molecular level onwards. Here we interconnect kinetic Monte Carlo simulations from the field of chemical kinetics and molecular dynamic simulations from the field of physics. We visualize for (in)organic network material synthesis how the initial building blocks interact timewise and spatially, accounting for variations in inter-and intramolecular chemical reactivity, diffusivity, segmental compositions, branch/network point locations, and defects. We use the kinetic and three-dimensional structural information to construct structure-property relationships based on molecular descriptors such as the molecular pore size or dangling chain distribution, differentiating between ideal and non-ideal structural elements. The generic nature is illustrated by constructing such relationships for the synthesis of organosilica, epoxy-amine and Diels-Alder based networks.

2020 IEEE International Interconnect Technology Conference (IITC)

We show that hyperconnected ULK dielectric glasses incorporating optimal precursor geometries lea... more We show that hyperconnected ULK dielectric glasses incorporating optimal precursor geometries lead to exceptional mechanical stiffness, as well as increasing fracture bond density. Using molecular dynamics and a novel graph theory approach, we predict that hyperconnected precursors with cyclic planar geometries significantly improve the mechanical reliability of these otherwise fragile materials, by not only increasing the network stiffness but also contributing to the fracture energy. Ultimately, we conclude that characterizing the implications of structural elements, such as precursor geometry and network connectivity, on the mechanical and fracture properties is essential for mechanically much more reliable design and integration of ULK dielectric materials.

We show that there is a strong relation between the bulk modulus and elastic deformation characte... more We show that there is a strong relation between the bulk modulus and elastic deformation characteristics of ULK organosilicate glasses. Our results indicate that the degree of deviation from homogeneous translation of the simulation cell deformation to molecular level is related to the constraints imposed by the precursor geometry and mean network connectivity of the structure. Characterization of this relation for a range of hybrid glasses that have different precursor geometries and network connectivity values is an important step towards establishing a robust molecular level design criteria to achieve desired mechanical properties of ULK glass materials.