TERASPIN · Spin-sensitive ultrafast Terahertz spectroscopy to elucidate exciton dynamics in conjugated polymers
6РП — Действия „Мария Кюри“
- Период
- 2006-12-01 → 2008-02-29
- Финансиране от ЕС
- 134 698 €
- Участници
- 1
- Схема
- EIF
Линиите свързват координатора с партньорите.
Накратко на български
Терахерцовата спектроскопия анализира поведението на водата около клетъчните мембрани и проводимостта на метални оксиди. Тези данни помагат за разбирането на работата на клетъчните мембрани и създаването на нови оптоелектронни устройства.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - TERASPIN (Spin-sensitive ultrafast Terahertz spectroscopy to elucidate exciton dynamics in conjugated polymers)
The main objective of this project was to get me trained on the innovative spectroscopic technique of time domain terahertz (THz) spectroscopy which was applied to the study of conjugated conductive polymers. Therefore, the first months were spent by me in order to learn about this highly innovative technique. To this purpose I started to collaborate on an already started project in the group of Professor Bonn. This project was focussed on the study of the behaviour of water bound to lipid-membranes. This was a very important topic in biophysics where THz spectroscopy was recently proved to be an invaluable tool for investigating the molecular mechanisms acting in many biologically relevant materials. During this training I started to find very interesting results. I investigated using Thz spectroscopy the influence of membrane confinement on the dynamics of the water hydrogen-bond-network. I found a dramatic suppression of the collective vibrational mode of the hydrogen-bond-network as compared to bulk water. This result could shed light on the role of bound water in the functioning of cell membranes. During this main project I also studied other materials of interest for my original research activity in Napoli. In particular, I investigated through THz pump-probe spectroscopy the photoinduced conductivity in single crystals of strontium titanate. This material belonged to the family of metal oxides. The latter attracted a great interest from the scientific community for their potentialities in the fabrication of innovative optoelectronic devices. For the first time I measured the photoinduced THz dielectric response of these materials. These data, which I was still analysing by the time of the project completion, would surely shed some light on the elusive nature of the photocarriers in these materials. A better knowledge of the basic transport mechanisms in these materials would give the possibility of tailoring new efficient optoelectronic devices based on metal oxides.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The primary objective of this proposal is for the applicant to gain knowledge regarding the highly innovative spectroscopic technique of time-resolved Terahertz (THz) spectroscopy. In addition to the training aspect, important, fundamental scientific quest ions will be addressed, which are very relevant for the field of organic electronics one of the key strategic technological topics for the EU. In particular, I propose an extension of the standard THz approach to make it suitable for investigating, in conjugated polymers, the interplay between different spin states of excitons.Excitons are the neutral excited state, in which the oppositely charged electron and hole are bound together, but have not yet recombined by photon emission. They, and particularly their spin state, are essential for applications of conjugated polymers in devices such as solar cells and light emitting diodes (LEDs). There is an intense debate regarding the role of triplet-to-singlet spin conversion of excitons formed upon charge injection, which influences the light emission efficiency in organic LEDs. These controversies may be traced to the lack of a clear and complete understanding of the specific interchain interactions that play a fundamental role in the charge carrier recombination process, especially at the early stages (i.e. on femtosecond timescales). This gap in this knowledge is caused by inherent limitations of many of the applied experimental tools. We propose to circumvent these drawbacks by investigating the spin dynamics of excitons in polymers in a quantitative manner with the help of this ultra-fast, all-optical, non-invasive technique based on THz spectroscopy.This fellowship will reinforce the applicants' professional maturity and independence. In particular, applying this unique technique to key questions on the photophysics of organic materials for electronics will have significant added value, not in the least for the research purposes of his laboratory of origin.
Оригинален текст от CORDIS (на английски).
Участници
- STICHTING VOOR FUNDAMENTEEL ONDERZOEK DER MATERIE · UTRECHTКоординаторНидерландия
Връзки
Данни: CORDIS, © Европейски съюз