Dissertation/ Thesis
Molecular Arrangement in ultrathin films. Thin films effect in optoelectronic devices
| العنوان: | Molecular Arrangement in ultrathin films. Thin films effect in optoelectronic devices Formación de nuevas estructura moleculares en películas ultrafinas.Preparación de dispositivos electroluminiscentes y fotovoltaicos |
|---|---|
| المؤلفون: | Roldán-Carmona, C. |
| Thesis Advisors: | Camacho Delgado, Luis, Bolink, H. |
| بيانات النشر: | Universidad de Córdoba, Servicio de Publicaciones. |
| مصطلحات موضوعية: | Ultrathin films, Organic electronic, Optoelectric devices, Películas ultrafinas, Dsipositivos electroliminiscentes y fotovoltaicos, Electrónica orgánica |
| الوصف: | The evolution of technology has to meet the energetically needs of actualsocieties and be respectful for the environment through a sustainable and efficient useof energy. In this context organic electronic represents a promising technology.Organic semiconductors are abundant, easy to fabricate and their properties can beeasily tuned. In the form of thin films, they exhibit interesting electronic and magneticproperties, which in many cases result from the specific molecular organization andinteractions of their components. A low cost organic alternative to the classicallighting systems are the light-emitting electrochemical cells (LECs),. They requireonly one ionic emitting layer, are processed at ambient conditions and are compatiblewith air stable electrodes, avoiding rigorous encapsulation in inert atmosphere.Recently, LECs have shown high luminance, high efficiencies and relatively highstabilities when specific emitters were used. However, their slow response, their selflimitingnature and the absence of efficient white light emission, remain thelimitations preventing their application in general lighting. On the other hand, organicthin films can also be used in photovoltaics, which represents an abundant and lowcost alternative to the silicon established solar cell technology. Nevertheless, theirrecord efficiency (~ 12%) is still below the requirements for a massive application.This suggests the need of new materials and configurations to achieve efficienciesclose to those obtained in inorganic Si-cells (20 - 25%) but reducing themanufacturing costs.In this Thesis, thin films are studied from two different points of view: asorganized ultra-thin systems containing UV-Vis absorbing molecules, frequently usedin many optoelectronic devices; and as interlayers in LECs and OPV devices. In thefirst case, two superficial techniques, the Brewster Angle Microscopy and the UV-VisReflection Spectroscopy, are studied in order to obtain useful information from suchhighly organized systems. A new detailed description of the theoretical treatmentneeded for each technique is presented, which provides, through a relatively simple... |
| نوع الوثيقة: | Dissertation/Thesis |
| اللغة: | English |
| URL الوصول: | http://hdl.handle.net/10396/12444 |
| رقم الانضمام: | edstdx.10803.284002 |
| قاعدة البيانات: | TDX |
| الوصف غير متاح. |