Direct self-assembling and patterning of semiconductor quantum dots on transferable elastomer layer

Coppola, Sara; Vespini, Veronica; Olivieri, Federico; Nasti, Giuseppe; Todino, Michele; Mandracchia, Biagio; Pagliarulo, Vito; Ferraro, Pietro

doi:10.1016/j.apsusc.2016.12.071

Cited by 17 publications

(8 citation statements)

References 44 publications

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“…Usually, after a lower quantum dot layer is deposited and covered by a cap layer, the strain and stress distribution at cap layer surface is formed. As an upper QDs layer is deposited on the surface, the uniformity of the QDs is improved by the stress distribution which known as vertical self-organization or self-assembly feature [18]. To deeply study the self-assembly behavior of QDs caused by strain and stress, some researchers have carried out various work.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of stress and strain distribution in coupled pyramidal InAs quantum dots embedded in GaAs by finite element method

et al. 2019

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Stress and strain distributions in and around a single or two-coupled pyramidal InAs quantum dots (QDs) embedded in GaAs are calculated by finite element methods according to the continuum elasticity theory. By changing the quantum dot spacing and thickness of cap layer, the results about strain and stress distributions show compressive strain and stress distribution in the QDs and relaxation undergoes two stages with different speeds for different quantum dot height, quantum width and thickness of cap layer. The stress and strain distributions of pyramidal QDs would not vary monotonously with geometric dimensions. The height of quantum dot and cap layer thickness can effectively adjust the vertical correlation of self-assembly QDs according to the calculation. The shape of stress distribution at surface of cap layer can be tuned from a quadrangle into a circle by increasing the thickness of cap layer or decreasing the height of quantum dot. Also, a new approach to grow quantum ring is found in this paper. The calculations of two-coupled QDs show that the self-assembly technology might fail if the horizontal distance between two QDs is not large enough. The stress induced by upper QDs will be relaxed to zero with a longer distance downwards is found in this paper.

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Section: Introductionmentioning

confidence: 99%

Theoretical study of stress and strain distribution in coupled pyramidal InAs quantum dots embedded in GaAs by finite element method

et al. 2019

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“…As final step, the temperature profile was coupled to the alternating current (AC)/DC module, and the pyroelectric field was estimated. The calculation of the pyroelectric field was carried out (as already showed in previous works [36][37][38][39] ) by imposing a remnant electric displacement proportional to the temperature difference (with respect to the ambient temperature) and to the pyroelectric coefficient of the LN (p ¼ À4 Â 10 À5 CK À1 m 2 ). Figure 2a shows the calculated electric potential on the surface of the LN crystal due to the electrical Joule heating of the μH.…”

Section: Simulationsmentioning

confidence: 99%

Pyroelectric Tweezers for Handling Liquid Unit Volumes

Nasti

Coppola

Vespini

et al. 2020

Advanced Intelligent Systems

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Liquids are the primary environments in which chemical, physical, and biological processes occur. Considering a liquid bridge as liquid unit volume (LUV) element, it is highly desirable to develop reliable tools for handling such volumes. Herein, a sort of intelligent microfluidic platform based on the pyroelectric‐electrohydrodynamics (EHD) is shown for manipulating liquid bridges and thus performing multiple functions in a flexible and simple way. Several basic operations with liquid bridges using an EHD‐pin matrix based on the pyroelectric effect engineered in ferroelectric crystals are demonstrated. By activating pyro‐EHD effect in predetermined positions (pins of the array), the locomotion and handling of single or multiple LUVs simultaneously are controlled. In particular, multiple operations such as lift, displacement, mixing, stretching, and carrying vector for microparticles, are shown. These tweezers based on a pyro‐EHD matrix can open the route for a multipurpose platform driven by physical intelligence and can be used for driving locomotion and operate manifolds functionalities in many areas of science and technology at microscale as well as nanoscale with advantages to be activated by the sole thermal stimulus, controlled remotely, and in noncontact mode.

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“…Therefore, surface tension may potentially be used to sculpt synthetic structures, and a sapient modulation of such tensions might, in principle, allow us to use liquids as molds for a rapid and versatile fabrication of complex material surfaces. Recently, a new method for controlling the surface tension and the capillarity as driving forces for the formation of liquid nanofluidic instabilities and polymer shapes has been proposed (18)(19)(20)(21). In particular, this method is able to control the shape of unsteady polymeric structures by an electrohydrodynamic pressure to cure them by appropriate thermal treatments, finalizing them for photonic application and biomedical devices.…”

Section: Introductionmentioning

confidence: 99%

Quick liquid packaging: Encasing water silhouettes by three-dimensional polymer membranes

et al. 2019

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One of the most important substances on Earth is water. It is an essential medium for living microorganisms and for many technological and industrial processes. Confining water in an enclosed compartment without manipulating it or by using rigid containers can be very attractive, even more if the container is biocompatible and biodegradable. Here, we propose a water-based bottom-up approach for facile encasing of short-lived water silhouettes by a custom-made adaptive suit. A biocompatible polymer self-assembling with unprecedented degree of freedom over the water surface directly produces a thin membrane. The polymer film could be the external container of a liquid core or a free-standing layer with personalized design. The membranes produced have been characterized in terms of physical properties, morphology and proposed for various applications from nano- to macroscale. The process appears not to harm cells and microorganisms, opening the way to a breakthrough approach for organ-on-chip and lab-in-a-drop experiments.

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Direct self-assembling and patterning of semiconductor quantum dots on transferable elastomer layer

Cited by 17 publications

References 44 publications

Theoretical study of stress and strain distribution in coupled pyramidal InAs quantum dots embedded in GaAs by finite element method

Theoretical study of stress and strain distribution in coupled pyramidal InAs quantum dots embedded in GaAs by finite element method

Pyroelectric Tweezers for Handling Liquid Unit Volumes

Quick liquid packaging: Encasing water silhouettes by three-dimensional polymer membranes

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