Wafer-Scale Programmed Assembly of One-Atom-Thick Crystals

Yang, Seong-Jun; Jung, Ju-Hyun; Lee, Eun-Sook; Han, Edmund; Choi, Min‐Yeong; Jung, Dae-Sung; Choi, Shinyoung; Park, Jun-Ho; Oh, Dongseok; Noh, Siwoo; Kim, Ki-Jeong; Huang, Pinshane Y.; Hwang, Chan‐Cuk; Kim, Cheol‐Joo

doi:10.1021/acs.nanolett.1c04139

Cited by 20 publications

(14 citation statements)

References 35 publications

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Section: Stacking Boundary Engineeringmentioning

confidence: 99%

“…[ 10–12,102–104 ] For the films to be suitable for the atomically clean assembly using the “pick‐up” method, the interaction energy between the growth substrate and as‐grown films needs to be lower than the vdW interactions between assembly units. [ 105,106 ] For instance, single‐crystalline graphene and hBN films are bound to the epitaxy substrate; therefore, chemical etching of the substrate is required to isolate the 2D films, which contaminate the interfaces. [ 107 ] A recent study shows that single‐crystalline graphene and hBN monolayers grown on Ge(110) substrates can be assembled, assisted by vdW interactions, to form wafer‐scale films of pristine interfaces with near‐unity yield (Figure 5e,f).…”

Section: Stacking Boundary Engineeringmentioning

confidence: 99%

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Engineering Grain Boundaries in Two‐Dimensional Electronic Materials

2022

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To utilize the intrinsic properties of 2D materials, it is important to control both interlayer interfaces and intralayer dislocations. Significant efforts have been made mostly to suppress the formation of crystalline disorders by developing advanced material growths [10][11][12] and integration techniques, [13] resulting in single-crystalline materials with atomically clean interfaces. However, structural boundaries can provide exciting control knobs to program the material properties beyond what is available in the thermodynamically most stable forms if the boundaries are fabricated controllably. Prototypical examples are the electrical doping of materials by introducing impurities [14] and optimizing device performances for targeted functionalities by forming heterojunctions. [15] Furthermore, 2D materials of van der Waals (vdW) structures arbitrarily enable the control of their atomic configurations due to the weak interlayer interactions. Therefore, various types of structural boundaries with different crystalline symmetries and band structures have been reported even in a single material platform by atomic displacements, [16,17] crystalline misorientation, [18] and distortions of chemical bonding [19,20] without the introduction of foreign materials. They have provided testbeds to discover novel electrical properties, [21] which are inaccessible in perfect crystals. However, direct applications of the material properties are elusive due to the lack of techniques to precisely control the boundaries over technologically relevant scales.In this review, we discuss about the emerging properties of structural boundaries in vdW structures and the developments of techniques to control the boundaries at the atomic scale. We focus on boundary structures caused by atomic displacements within a single-crystalline material, rather than heterogeneous boundaries with chemical complexity, which have been summarized in detail elsewhere. [22] We discuss the remaining critical issues to reproduce functional boundaries by a designer approach for the discovery of properties and applications in electronics and provide our outlook on the directions in the field. Boundary Types and Related Properties in vdW SolidsA grain boundary is an interfacial plane that exists between two perfect crystallites. The boundaries are not randomly formed, and the resultant structures are restricted by the crystalline lattices, in which they are embedded. The structural defects emerge at the boundaries of misaligned crystalline domains, whose rotation axis most likely points to the out-of-plane Engineering the boundary structures in 2D materials provides an unprecedented opportunity to program the physical properties of the materials with extensive tunability and realize innovative devices with advanced functionalities. However, structural engineering technology is still in its infancy, and creating artificial boundary structures with high reproducibility remains difficult. In this review, various emergent properties of 2D materials with different ...

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Section: Stacking Boundary Engineeringmentioning

confidence: 99%

Section: Stacking Boundary Engineeringmentioning

confidence: 99%

Engineering Grain Boundaries in Two‐Dimensional Electronic Materials

2022

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“…are currently underway. [38][39][40] 2. Transfer invariabilities and Si CMOS compatibility: One of the major hurdles that hinder the quest for Gr device commercialization is the transfer invariabilities.…”

Section: Large Scale Synthesismentioning

confidence: 99%

Unraveling the Translational Exchange between Academic Research and product Scale-up for disruptive technologies: Critical Comments on Devices and path forward.

Nandi

Vijayan²,

Chhetri

2022

Preprint

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Academic translational research efforts to industry are often an underlying sought-after goal among the researchers. Through the interchanges of research endeavors between academia-industry, great innovations can/has been achieved that cater to the real-world application by bridging “industrially relevant” problem solving with pursuing fundamental concepts. It is pertinent that most of the studies from university level research works may not translate into demonstrable products in the market as many factors are at play here which are beyond the scope or reach of academic researchers. Funding support, individual goals of researchers, socio-economic factors and most importantly the technical know-how of generating revenue strategies to make it a profitable startup are few of the factors that have slowed the pace of collaborative efforts. However, we believe that the most critical factor is identification of the critical parameters that solves long standing problems that hinder the scale-up of the lab scale research into marketable products. To illustrate this, we take three most relevant examples, devices for fuel generation, devices to utilize solar radiation and devices for sensing and other related applications. In this perspective article, we provide an in-depth case study of each of these critical parameters to comment on the direction of research avenues that can serve as step-stones for the commercialization of university-level lab research studies.

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“…Combination of hexagonal boron nitride (hBN) with graphene into van der Waals heterostructures attracted much attention at a recent time [1][2][3][4] . hBN is an insulator with a large bandgap that possesses honeycomb crystal structure commensurate to the one of graphene, but with a slight mismatch of the lattice constants.…”

Section: Introductionmentioning

confidence: 99%

Anomalous optical response of graphene on hexagonal boron nitride substrates

Toksumakov

Ermolaev

Tatmyshevskiy

et al. 2022

Preprint

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Graphene/hBN heterostructures can be considered as one of the basic building blocks for the next- generation optoelectronics mostly owing to the record-high electron mobilities. However, currently the studies of optical properties of graphene are limited to the standard substrates (SiO2/Si, glass, quartz) despite the growing interest in graphene/hBN heterostructures. This can be attributed to a challenging task of the determination of hBN’s strongly anisotropic dielectric tensor in the total optical response. In this study, we overcome this issue through imaging spectroscopic ellipsometry utilizing simultaneous analysis of hBN’s optical response with and without graphene monolayers. Our technique allowed us to retrieve the optical constants of graphene from graphene/hBN heterostructure in a broad spectral range of 250 - 950 nm. Our results suggest that graphene’s absorption on hBN may exceed the one of graphene on SiO2/Si by about 60%.

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Wafer-Scale Programmed Assembly of One-Atom-Thick Crystals

Cited by 20 publications

References 35 publications

Engineering Grain Boundaries in Two‐Dimensional Electronic Materials

Engineering Grain Boundaries in Two‐Dimensional Electronic Materials

Unraveling the Translational Exchange between Academic Research and product Scale-up for disruptive technologies: Critical Comments on Devices and path forward.

Anomalous optical response of graphene on hexagonal boron nitride substrates

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