MICAtronics: A new platform for flexible X-tronics

Bitla, Yugandhar; Chu, Ying‐Hao

doi:10.1016/j.flatc.2017.06.003

Cited by 161 publications

(147 citation statements)

References 186 publications

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“…Cleavage of muscovite (KAl 2 (Si 3 Al)O 10 (OH) 2 : a = 5.33 Å, b = 9.23 Å, c = 10.22 Å, and β~100°) along this vdW gap layer produces two large, atomically flat surfaces, with equal but randomly distributed K + atoms preserving charge neutrality, making muscovite mica an ideal substrate for vdW heteroepitaxy. 27 The surface of mica provides an interesting playground for the study of 2D ion diffusion, 2D crystal nucleation, surface conductivity, molecular surface phenomena of adhesion, friction, and colloidal interactions. 28 Gold thin film on muscovite substrate was an early demonstration of a heteroepitaxy with mica substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is very crucial to examine the characteristics of muscovite and identify key features of this type of oxide heteroepitaxy. 27 Mica possesses very high yield strain and the thickness of a single cleaved mica sheet can be controlled down to few microns with superior flexibility. In fact, a bending radius down to 0.03 cm is reported for 100 nm thick mica sheet.…”

Section: Introductionmentioning

confidence: 99%

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Van der Waals oxide heteroepitaxy

Chu

2017

npj Quant Mater

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145

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The research field of oxide heteroepitaxy suffers from the characteristics of misfit strain and substrate clamping, hampering the optimization of performance and the gain of fundamental understanding of oxide systems. Recently, there are demonstrations on functional oxides epitaxially fabricated on layered muscovite substrate. In these heterostructures, due to the weak interaction between substrate and film, they show the lattice of films close to bulk with excellent strictive properties, suggesting that these critical problems can be potentially solved by van der Waals oxide heteroepitaxy. In addition, by exploiting the transparent and flexible features of muscovite, such a heteroepitaxy can deliver new material solutions to transparent soft technology. In this paper, the history, development, and current status of van der Waals oxide heteroepitaxy are addressed and discussed. In the end, new research directions in terms of fundamental study and practical application are proposed to highlight the importance of this research field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Van der Waals oxide heteroepitaxy

Chu

2017

npj Quant Mater

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145

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“…A fast-growing field is van der Waals oxide epitaxy. 65,66 It has been demonstrated that several different oxides can be grown heteroepitaxially on mica by van der Waals bonds. The benefit of van der Waals epitaxy (vdWE) is that the film can be grown strain free retaining the bulk lattice parameters even at large lattice mismatch.…”

Section: Concluding Remarks and Future Workmentioning

confidence: 99%

Growth and thermoelectric properties of CaMnO3-based thin films

Ekström¹

2018

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The field of thermoelectrics started in early 19 th century. Since the discovery of the Seebeck effect and the Peltier effect, thermoelectric modules have found their way into, mostly, niche applications such as radioisotope thermoelectric generators on space missions. Thermoelectric modules can also be used for cooling, utilizing the Peltier effect.Thermoelectrics are promising materials due to the operation nature of the modules. That is, they have no moving parts, no exhaust, long lifetime without maintenance, features that make them attractive for many applications. Despite these promising properties, thermoelectric modules are mostly used in niche applications. The main reason for this is conventional modules with the highest efficiency are commonly made of expensive and/or rare elements which prevents mass production.To tackle this problem, new materials are investigated to find a module that can be made widely available. Oxides are one possibility, where an added benefit is that they are chemically stable even at elevated temperature. The perovskite CaMnO3 is one of the more promising oxides, with elements that are abundant on earth and cheap. The material does suffer from low electrical conductivity which results in a low electrical conductivity and efficiency. A substantial effort has been put in to increase the efficiency of CaMnO3, but it still needs improvement.In my thesis, I have investigated the CaMnO3 system. CaMnO3 was synthesized using co-reactive RF-magnetron sputtering and post annealing. The synthesis method is already known but has not been used for deposition of perovskites. I have also demonstrated that this synthesis method can be used to dope CaMnO3 with niobium at appropriate levels for enhancing the efficiency. During the course of research underlying this thesis, I was enrolled in Agora Materiae, a multidisciplinary doctoral program at Linköping University, Sweden. VI VII Populärvetenskaplig SammanfattningMed dagens utveckling av teknologi ökar behovet av elektricitet. Många teknologier är små saker som behöver egna energikällor t.ex. sensorer. Dessa kan sitta på människokroppen, i datorer, i olika industrier och andra miljöer. Det de har gemensamt är att alla behöver en tillförlitlig kraftkälla som i många fall behöver fungera utan något underhåll samt ta lite plats.Ett annat problem i samhället är det stora slöseriet med energi i form av spillvärme, det vill säga en oönskad restprodukt, från i stort sett alla processer. Denna värme är i många fall helt outnyttjad och om man kunde ta till vara på denna värme skulle effektiviteten av många processer kunna ökas.Jag har undersökt material som skulle kunna lösa dessa problem, nämligen termoelektriska material. Sådana material har förmågan att omvandla värme till elektricitet och det som driver denna förmåga är Seebeck-effekten, uppkallad efter Thomas Seebeck som upptäckte den i början av 1820-talet. De fungerar genom att materialet har en varm och en kall sida. På den varma sidan rör sig elektronerna snabbare än på den kalla sid...

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“…Recently, the advent of 2D layered mica breaks new ground in fabricating flexible all‐inorganic films because of the atomically flat surface, chemical inertness, heat resistance, and so on. [ 17 ]…”

Section: Introductionmentioning

confidence: 99%

Flexible Lead‐Free Perovskite Oxide Multilayer Film Capacitor Based on (Na_0.8K_0.2)_0.5Bi_0.5TiO₃/Ba_0.5Sr_0.5(Ti_0.97Mn_0.03)O₃for High‐Performance Dielectric Energy Storage

Yang

Qian

et al. 2020

Advanced Energy Materials

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Flexible thin film dielectric capacitors with high energy storage density and a fast charging–discharging rate have attracted increasing attention as the development of microelectronics progresses toward flexibility and miniaturization. In this work, an all‐inorganic thin film dielectric capacitor with a multilayer structure based on (Na0.8K0.2)0.5Bi0.5TiO3 and Ba0.5Sr0.5(Ti0.97Mn0.03)O3 is designed and synthesized on a mica substrate. By optimizing the periodic number (N), concomitantly enhanced breakdown strength and large polarization difference are achieved in the film with N = 6, which contributes to the large energy density (Wrec) of 91 J cm−3, high efficiency (η) of 68%, and fast discharging rate of 47.6 µs. The obtained energy density is the highest value up to now in flexible dielectric capacitors, including lead‐free and lead‐based inorganic films as well as organic dielectric films. Moreover, no obvious deterioration of the energy storage performance is observed in the wide ranges of working temperature (−50–200 °C), operating frequency (500 Hz to 30 kHz), and fatigue cycles (1–108). Besides, the Wrec and η are ultra‐stable under various bending radii (R = 12–2 mm) and even after 104 bending cycles at R = 4 mm, demonstrating an outstanding mechanical bending endurance. This excellent performance will allow the capacitor thrive in flexible microenergy storage systems.

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MICAtronics: A new platform for flexible X-tronics

Cited by 161 publications

References 186 publications

Van der Waals oxide heteroepitaxy

Van der Waals oxide heteroepitaxy

Growth and thermoelectric properties of CaMnO3-based thin films

Flexible Lead‐Free Perovskite Oxide Multilayer Film Capacitor Based on (Na_0.8K_0.2)_0.5Bi_0.5TiO₃/Ba_0.5Sr_0.5(Ti_0.97Mn_0.03)O₃for High‐Performance Dielectric Energy Storage

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MICAtronics: A new platform for flexible X-tronics

Cited by 161 publications

References 186 publications

Van der Waals oxide heteroepitaxy

Van der Waals oxide heteroepitaxy

Growth and thermoelectric properties of CaMnO3-based thin films

Flexible Lead‐Free Perovskite Oxide Multilayer Film Capacitor Based on (Na0.8K0.2)0.5Bi0.5TiO3/Ba0.5Sr0.5(Ti0.97Mn0.03)O3for High‐Performance Dielectric Energy Storage

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Flexible Lead‐Free Perovskite Oxide Multilayer Film Capacitor Based on (Na_0.8K_0.2)_0.5Bi_0.5TiO₃/Ba_0.5Sr_0.5(Ti_0.97Mn_0.03)O₃for High‐Performance Dielectric Energy Storage