FP6Индивидуална стипендия2007–2010

TOPOS · Tailoring growth and opto-electronic properties for organic nanoscale semiconductor devices

6РП — Действия „Мария Кюри“

Период: 2007-08-13 → 2010-08-12
Финансиране от ЕС: 258 172 €
Участници: 2
Схема: OIF

Линиите свързват координатора с партньорите. За проекти отпреди 2014 г. CORDIS не винаги дава точни координати. Тези точки са на ниво град или държава.

Накратко на български

Органичните полупроводници и използването на въглеродни нанотръби като електроди подобряват преноса на заряд в гъвкавите електронни устройства. Това помага за създаването на по-ефективни сензори за химически и биологични анализи.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Final Activity and Management Report Summary - TOPOS (Tailoring Growth and Opto-Electronic Properties for Organic Nanoscale Semiconductor Devices)

Organic electronics devices are of enormous interest for low-cost, large-area, flexible electronics and, at the same time, they offer unique opportunities for fundamental research. In this project I focused on two aspects of organic electronics that are attracting a great deal of interest in the community: charge injection in organic field effect transistors and mixed ionic/electronic conductivity. Charge injection is an issue of paramount importance in organic field effect transistors. The presence of Schottky barriers at the interface between the metal electrodes and the organic semiconductors often limits injection efficiency and results in degraded device performance. To overcome this issue I explored the use of single wall carbon nanotubes (CNTs) as electrode materials in OFETs. Thanks to their field emission properties, CNTs are able to inject both electrons and holes into organics with low injection barriers, promoting tunnelling injection. I used using CNT array electrodes, having one end connected to a large metal (Ti) pad and the other end embedded in the organic semiconductor layer. Devices with CNTs electrodes showed improved injection and switching characteristics compared with those using conventional metallic electrodes both for and p-type (phthalocyanines) and n-type (fullerene derivative) materials. The ability of organic semiconductors to conduct ionic in addition to electronic carriers, has been exploited to demonstrate novel devices. Among these, organic electrochemical transistors are particularly promising for applications in chemical and biological sensing and are expected to play a primary role in the emerging field of organic bioelectronics. These devices can be operated in aqueous electrolytes as ion-to-electron converters, thus providing an interface between the worlds of biology and electronics. During this project I explored the device of physics organic electrochemical transistors and gave a significant contribution in establishing novel unconventional patterning techniques for device fabrication.

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

Цел на проекта

TOPOS addresses a deeper understanding of growth processes of organic films with the aim to develop nano-scale organic field-effect transistors (i.e. transistors with source-drain inter-electrodes distance varying from hundreds to a few nanometres). Fabrication of nano-scale organic field-effect transistors (OFET) is an attractive and challenging task involving both technological and fundamental issues. Our approach to nano OFET fabrication combines a sophisticated nano-scale fabrication technique, i.e. e-beam lithography, adopted to engineer the device at the nanoscale, with the unique ability of Supersonic Molecular Beam Epitaxy (SuMBE) to control morphology, structure and interfaces of molecular organic layers. Such combination of up to date methods is uniquely suitable to thoroughly study the key factors determining the performance of the nano-transistors and hence for determining strategies towards new generations of devices.Our tasks involve: choice of the semiconductor material, optimisation of the growth of the organic active layer, selection of dielectric and electrode(s) material, substrate processing and patterning. We expect that our project will give a boost to the state-of-the-art of OFETs. Merging of two highly capable techniques (e-beam lithography and SuMBE) will enable the fabrication of well-defined and controlled samples, a critical key to improve our fundamental understanding of device physics at the nano-scale. In particular optimisation of nano-electrodes and tuning of the active layer morphology will make possible the study and the optimisation of device performance as a function of the channel length, including exploration of electrical properties down to the molecular level. This is something that is very much required by the organic electronics community.

Оригинален текст от CORDIS (на английски).

Участници

CONSIGLIO NAZIONALE DELLE RICERCHE ISTITUTO DI FOTONICA E NANOTECNOLOGIE · ROMAКоординаторНиво градИталия
DEPARTMENT OF MATERIALS SCIENCE AND ENGINEERING, CORNELL UNIVERSITY · ITHACA, NYНиво държаваСъединени щати