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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...
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 the influence of phase separation in the functioning of...
Correia, Helena M. G.; Ramos, Marta M. D.; Marques, L.; Barbosa, Helder M. C.Comunicação em poster ; Controlling and understanding the influence of the morphology of the active layer made of polymer/low weight molecules blend in organic solar cells (OSC) is, in our days, seen as one of the key issues to increase its efficiency. Most of the research in this area, is made at experimental level focusing not only on the influence of the molecular structure of the materials used, but also o...
Influência da morfologia da camada ativa no funcionamento de uma célula solar o...
Correia, Helena M. G.; Marques, L.; Barbosa, Helder M. C.; Ramos, Marta M. D.Resumo ; Nos últimos anos as células solares orgânicas (CSO) revelaram-se uma alternativa promissora às células convencionais de silício. Contudo, compreender e controlar a morfologia da camada ativa, constituída por uma mistura de um polímero com uma molécula de baixo peso molecular, são questões em aberto com inúmeras respostas, sendo este um problema central para aumentar a eficiência deste tipo de disposit...
Explicar os fenómenos físicos da eletrónica orgânica como motivação para a apre...
Barbosa, Helder M. C.; Correia, Helena M. G.; Marques, L.; Ramos, Marta M. D.Resumo e poster ; Plásticos a darem luz? Painéis fotovoltaicos a cobrirem edifícios? Jornais feitos apenas com uma folha? Sair do hipermercado sem passar pelo “caixa”? São questões que suscitam a curiosidade dos alunos dos ensinos básico e secundário e que servem de motivação para o ensino de uma grande variedade de fenómenos físicos que ocorrem numa nova área tecnológica multidisciplinar, a da eletrónica orgâ...
The influence of ion doping profile in the functioning of polymer light emissio...
Pereira, André; Martins, João Paulo; Barbosa, Helder M. C.; Correia, Helena M. G.; Marques, L.; Ramos, Marta M. D.One of the strategies to enhance efficiency of Polymer Light Emission Diodes (PLEDs), is to dope the conjugated polymer with ionic species (organic or inorganic). Although it is proven by experiments that this kind of doping can enhance PLEDs efficiency, it is not clear how the spatial distribution of the ionic species within the polymer layer can affect all the electronic process underlying the PLEDs functioni...
The influence of generated charges on the functioning of polymer photodiodes : ...
Pereira, André; Barbosa, Helder M. C.; Correia, Helena M. G.; Ramos, Marta M. D.
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