H2020Индивидуална стипендия2020–2022

atoGRAPH · Near-Infrared Optoelectronic Devices with Atomically Controlled Graphene Nanostructures

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-02-10 → 2022-02-09
Финансиране от ЕС: 172 932 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Графенови наноструктури с размер под 5 нанометра се изследват за създаване на устройства, работещи в близкия инфрачервен спектър. Те позволяват по-бърза комуникация на данни, по-добра диагностика на рак и по-висока разделителна способност при изображенията.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Near-Infrared Optoelectronic Devices with Atomically Controlled Graphene Nanostructures

Plasmons, light-induced collective excitations of electrons, are the pivotal strategy to integrate electronics and optics at the nanoscale enabling single-molecule detection, improved photovoltaics, nanoscale photometry, cancer therapy, or nonlinear optics. Plasmon properties offer sub-wavelength optical confinement for enhanced imaging resolution and huge optical enhancements by strong light-matter interaction at nanostructures for colour generation. More interestingly, two dimensional (2D) graphene-plasmons are electrically tunable by electrostatic doping, enabling order-unity changes in absorption and tunable excitation plasmon energies. Additionally, the graphene’s high mobility extends its application to ultrafast light modulation up to 100s GHz commutation rates. However, graphene plasmons have been observed at mid-infrared wavelengths, which are far from the near-infrared (NIR) telecom range. To further tune graphene-plasmons to higher frequencies is necessary to open a bandgap by confining the lateral size (D), since the frequency scales as square root of (E_Fermi/D). Therefore, reaching the telecommunication frequency regime (E_fermi approximately 1 eV) requires a lateral size D reduction below 5 nm, which is beyond the state-of-art of top-down lithography. Interestingly, covalent self-assembly of graphene-like building blocks such as polycyclic aromatic hydrocarbons render atomically precise 1-3 nm-wide graphene nanoribbons (GNR) by controlling sequential reactions on catalytic substrates. The GNR quantum confinement shifts graphene plasmons to the visible and near-infrared (vis-NIR). However, GNRs are rather short (~30 nm) and randomly distributed on the surface. To date, little effort has been directed to control their size and the overall morphology of the ensemble, setting a barrier for the implementation of GNRs on actual devices. As a solution, we propose two-dimensional (2D) nanoporous graphene (NPG) consisting in covalently bonded parallel arrays of ultra-long GNRs (>200 nm) featuring nanopores of 0.4-0.9 nm. Indeed, the theoretical optical response of NPG reveals a remarkable change in absorption at vis-NIR peaks by increasing the doping level to 1 eV, just at the telecom range. Therefore, the overall objective is to explore the feasibility of fabricating gate-modulated optoelectronic devices based on atomically precise graphene nanostructures, as a new venue to expand graphene into the vis-NIR region.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The extraordinary and ultrafast electro-optical response of graphene nanostructures has enabled order-unity changes in absorption due to the switching on and off of plasmons via electrical gating, thus suggesting application to ultrafast light modulation. Unfortunately, graphene plasmons have so far been observed at mid-infrared and longer wavelengths, therefore limiting their use as optoelectronic devices in the visible and near-infrared (vis-NIR) spectral range. Reaching this energy regime requires an efficient doping of graphene by confining the lateral dimension below 5 nm, which is beyond the state-of-art top-down lithography resolution. Alternatively, this project will use a bottom-up chemical route recently developed by the host organization to synthesize atomically precise, 1nm wide, graphene nanoribbons (GNRs) that can couple laterally to give rise to either nanoporous graphene structures or laterally interconnected GNRs arrays, for efficient gate-doping. The project aims to explore the feasibility of fabricating optoelectronic devices based on the plasmonic properties of atomically precise graphene nanostructures. The nature of the project is highly multidisciplinary, involving a combination of well-developed chemistry, physics, electronics and photonics that will focus at three different levels: chemical synthesis of atomic-size GNRs and characterization, nanostructure transfer and device fabrication, and electro-optical characterization. This proposal promotes both the transfer of knowledge to the host institution and the training of the candidate in new advanced techniques. The proof-of-concept of such device will pave the way for ultra-high speed photodetectors that are capable of handling record data transmission at vis-NIR range, thus providing key solutions for next generation data communications. This project lines up perfectly with the EU strategy, “Graphene Flagship”, in fostering the emergence of foundational breakthroughs in graphene science.

Оригинален текст от CORDIS (на английски).

Участници

FUNDACIO INSTITUT CATALA DE NANOCIENCIA I NANOTECNOLOGIA · BELLATERRA (BARCELONA)КоординаторИспания