H2020Индивидуална стипендия2017–2019

exciTitania · Excitonic quasiparticles in Titania

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

Период: 2017-09-01 → 2019-08-31
Финансиране от ЕС: 158 122 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Титан диоксидът и неговите електронни възбуждания се анализират чрез теоретични изчисления и спектроскопия, за да се разбере как материалът реагира на светлина. Това помага за подобряване на енергийните преобразуватели, пречистването на въздуха и създаването на евтини сензори.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Excitonic quasiparticles in Titania

Titanium dioxide, also known as titania, is a one-of-a-kind metal oxide and semiconductor material employed in fields like photovoltaics, catalysis and air purification. To understand the unique properties of this material when exposed to light, we need to examine carefully the nature of its elementary charge excitations. Although titania has been studied in depth during the last decades, there are many unclear aspects about its optical response, as well as serious misconceptions on the chemical and physical processes triggered during its interaction with light. A deep understanding of the excitonic properties of TiO2 is of high relevance to achieve major advances in the aforementioned fields and may lead to the fabrication of new devices with enhanced performance in energy conversion applications. In exciTitania, we have worked towards the clarification of some intriguing characteristic of TiO2, including the anomalous dependence of its electronic and optical properties with the temperature, and its unexpected behaviour respecting the coherent motion of its crystal lattice. We have employed state-of-the-art theoretical calculations in close collaboration with researchers conducting advanced spectroscopy measurements. We have got remarkable new insights into the excitonic nature of TiO2. We discovered novel properties of titania single crystal and nanoparticles which could be used, for example, to build low cost sensors with specific functions. We also elucidated the mechanisms behind the generation of the coherent motions of the atoms in the material. Our investigation has also shed light to the migration of the charge carriers in TiO2, which, with further research, may explain why this semiconductor has so exceptional features for the degradation of air pollutants.

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

Цел на проекта

Although titanium dioxide (TiO2) is widely employed in fields like photovoltaics and photocatalysis, the nature of its fundamental charge transfer excitations is still unknown. A deep understanding of the excitonic properties of TiO2 is of high relevance to achieve major advances in the aforementioned fields and may lead to the fabrication of new devices with enhanced performance in energy conversion applications.In this research proposal we address three important aspects of the excitonic nature of TiO2, which have been raised by recent experiments and whose investigation requires exhaustive theoretical efforts. The first aspect is related to an observed anomaly in the temperature dependence of the excitons in both the rutile and anatase polymorphs of TiO2. The dependence of elementary excitations with temperature is a main subject in condensed matter physics, and its study provides crucial information on the quantum many-body interaction and correlation. The second aspect is about the interplay between charge transfer excitons and coherent phonons in TiO2. The experiments indicate again an unexpected behaviour of the semiconductor material in this respect. Finally, we aim to study the q-dispersion of the excitons, which will provide insightful knowledge on how these quasi particles propagates throughout the crystal.The recurrent anomalous behaviour of TiO2 makes it an even more fascinating material than it is already considered, and its study could broaden its field of applicability in unimaginable ways. With this proposal, we intend to pave the wave for an exciting future of this versatile semiconductor, using state-of-the-art theoretical calculations in close collaboration with researchers conducting advanced spectroscopy measurements.

Оригинален текст от CORDIS (на английски).

Участници

UNIVERSIDAD DEL PAIS VASCO/ EUSKAL HERRIKO UNIBERTSITATEA · LeioaКоординаторИспания