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Because the optimization of polymer semiconductors´ properties has been typically carried out via tuning their crystalline phase, many fundamental questions remain still unanswered about how the solid-state microstructure impacts optoelectronic properties in this class of materials, especially regarding the role of non-crystalline, glassy regions. In order to answer these questions, it is imperative to fully understand glassy phases and to include a more refined vision of them in structural models. Our group is interested in the structure, the dynamics and the thermodynamics of glassy phases of semiconducting polymers, which we study by fast scanning calorimetry, grazing incidence X-ray scattering (GIXS) and optical spectroscopies.
The properties of organic semiconducting materials and devices are critically linked to how molecules are packed together. Because the solid-state molecular order is mainly generated as a result of a crystallization process, it is of paramount importance to understand how this phase transformation occurs during the solution processing of thin films.
Our group aims at gaining understanding and control of the main structural and morphological features of organic solar cells. Employing a combination of fast scanning calorimetry, grazing incidence X-ray scattering –at wide and small angles—and optical microscopy and spectroscopies, we investigate both crystalline and glassy phases of solution processed donor:acceptor blends. Especial interest is on understanding intermixed domains and, specifically, how much intermixing allows to get an optimum compromise between charge generation and charge transport/charge extraction for each blend. To achieve so, we have developed a methodology based on fast scanning calorimetry that provides an absolute vale for the composition of intermixed amorphous domains.
We are interested in identifying the interrelationships between the processing, the solid-state microstructure and the optoelectronic properties of non-fullerene acceptors (NFAs). Moreover, we also aim at understanding the solid-state microstructure of the high-performing polymers for OPV.