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Theoretical study of exciton migration in polymer-based solar cells
Barbosa, Helder M. C.; Correia, Helena M. G.; Marques, Luís; Ramos, Marta M. D.Poster apresentado no "11º Encontro Nacional de Química Física - 11ºENQF", Porto, Portugal, 09-10 maio 2013. ; Organic solar cells (OSC) are one of the most promising green technologies for energy harvesting. In these devices the active layer is composed of an organic blend of two polymers or by low weight molecule and a polymer. In either case, due to the nature of the materials used, especially of the polyme...
Understand the importance of molecular organization at polymer-polymer interfac...
Correia, Helena M. G.; Barbosa, Helder M. C.; Marques, Luís; Ramos, Marta M. D.Comunicação em painel apresentada no E-MRS 2013 - Symposium B ; To improve the efficiency of organic solar cells is necessary, for instance, to increase the open-circuit voltage or increase sun-light absorption by covering complementary regions of the solar spectrum. This can be achieved by using a donor-acceptor system composed of two polymers. The versatility of these materials has the advantage of enabling ...
First-principles study of eletronic properties of radical polymers for organic ...
Barbosa, Helder M. C.; Marques, L.; Ramos, Marta M. D.Nowadays, there is an increasing demand for suitable energy storage devices to power the electronic devices used in a society continually oriented to technology and mobility. In order to solve this problem, and allied to environmental concerns, organic radical batteries (ORB) have been considered as possible solution by the electronic industry. In these devices, the electrodes consist on a moiety of a radical ...
Unravelling the effect of strand orientation on exciton migration in conjugated...
Correia, Helena M. G.; Barbosa, Helder M. C.; Marques, Luís; Ramos, Marta M. D.The study of the average distance that singlet excitons travel during their lifetime in conjugated polymers has attracted considerable attention during the past decade, because of its importance in the functioning of many polymer-based optoelectronic devices, like solar cells and photodetectors. Intriguingly, different values of exciton diffusion length have been extracted from experiments on seemingly identica...
Pulsed laser deposition of semiconducting nanoparticles : optical emission spec...
Marques, L.; Ramos, Marta M. D.; Gomes, M. J. M.Memory devices that use seminconductor nanocrystals (NC) for charge storage began to receive considerable attention in recent years due to their excellent performance, high capacity of memory and miniaturization. In order to integrate these materials into devices, formation of NCs and oxide layers with controlled stoichiometry, dimensions and homogeneity are required. Pulsed laser deposition (PLD) techniques ar...
Influence of electrode degradation on organic solar cells functioning – a compu...
Barbosa, Hélder M. C.; Correia, Helena M. G.; Marques, L.; Ramos, Marta M. D.Recently, organic solar cells (OSC) have reached the efficiency of 10% becoming a reliable alternative to the conventional high cost inorganic solar cells. However, to gain a place in the competitive market of solar cells it is necessary to improve their lifetime. Due to the nature of the materials used, there are several degradation mechanisms [1] that lead to a decrease on device efficiency and thus to its fa...
Multiscale modelling of electron transport in carbon nanotube reinforced compos...
Pyrlin, Sergey V.; Ramos, Marta M. D.Development of functional composite materials by addition of inorganic inclusions to polymer matrix attracts growing attention in last decades and carbon nanotubes (CNT) attract particular interest as reinforcement material due to their unique properties tunable by doping and functionalization. However such material characteristics depend not only on the concentration and properties of nanoinclusions but also o...
Multiscale modeling of composite structure-property relations : application to ...
Pyrlin, Sergey V.; Ramos, Marta M. D.Apresentação efetuada no European Congress and Exhibition on Advanced Materials and Processes - EuroMat 2013, em Sevilha, Espanha, 2013 ; Development of functional composite materials by addition of inorganic inclusions to polymer matrix attracts growing attention in last decades. However such material characteristics depend not only on the concentration and properties of nanoinclusions but also on their distr...
Heisenberg Uncertainty Principle in high school teaching
Pinto, Albino Rafael Mesquita; Marques, L.; Ramos, Marta M. D.In Portuguese high school curricula concepts of quantum physics are taught in the discipline of physics in the 12th year of education. These concepts underlie the functioning of modern nano devices and nanotechnologies, but are difficult to understand by the students of this level of teaching, thus making it necessary the integration of new strategies to facilitate teaching-learning process. In this we show ...
Optical emission spectroscopy study of pulsed laser deposition of semiconductin...
Marques, L.; Ramos, Marta M. D.; Gomes, M. J. M.Memory devices that use seminconductor nanocrystals (NC) for charge storage began to receive considerable attention in recent years due to their excellent performance, high capacity of memory and miniaturization. In order to integrate these materials into devices, formation of NCs and oxide layers with controlled stoichiometry, dimensions and homogeneity are required. The optimization of nanoparticle synthesis ...
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