Exploring the structural and optoelectronic properties of natural insulating phlogopite in van der Waals heterostructures
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Universidade Federal de Minas Gerais
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Naturally occurring van der Waals crystals have brought unprecedented interest to nanomaterial
researchers in recent years. So far, more than 1800 layered materials (LMs) have been identified but only a few insulating and naturally occurring LMs were deeply investigated. Phyllosilicate minerals, which are a class of natural and abundant LMs, have been recently considered as a low-cost source of insulating nanomaterials. Within this family an almost barely explored material emerges: phlogopite (KMg3(AlSi3)O10(OH)2). Here we carry out a high throughput characterization of this
LM by employing several experimental techniques, corroborating the major findings with
first-principles calculations. We show that monolayers (1L) and few-layers of this material are air
and temperature stable, as well as easily obtained by the standard mechanical exfoliation technique,
have an atomically flat surface, and lower bandgap than its bulk counterpart, an unusual trend in
LMs. We also systematically study the basic properties of ultrathin phlogopite and demonstrate
that natural phlogopite presents iron impurities in its crystal lattice, which decreases its bandgap
from about 7 eV to 3.6 eV. Finally, we combine phlogopite crystals with 1L-WS2 in ultrathin van
der Waals heterostructures and present a photoluminescence study, revealing a significant
enhancement on the 1L-WS2 optical quality (i.e. higher recombination efficiency through neutral
excitons) similarly to that obtained on 1L-WS2/hexagonal boron nitride heterostructures. Our
proof-of-concept study shows that phlogopite should be regarded as a good and promising
candidate for LM-based applications as a low-cost layered nanomaterial.
Abstract
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Optoeletrônica, Forças de van der Waals
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Phlogopite, 2D materials, Natural insulating, Optoelectronics
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https://iopscience.iop.org/article/10.1088/2053-1583/ac6cf4