Design and synthesis of organic charge selective layers for perovskite solar cells based on extended pi-conjugated molecules

In this project of thesis, it was studied the synthesis of three organic molecules which falls withing the nanographene. Nowadays, nanographenes are studied in material science as possible organic compounds to make nanolayer in new devices. In the case of these three molecules, the main goal is related with green energies and above all solar energy. In fact, it seems that these new nanographenes can be used as hole transport material (or electron transport material depending the electronic properties of the single molecule) causing an improvement in the device performances. During the design of the synthetic rout for each molecule, was kept in mind the final aim of a daily industrial process. For this reason, the reaction used are common organic reaction such as Suzuki – Miyaura coupling reaction, Diels – Alder reaction and Scholl reaction. After the synthesis, experiments of characterization were performed. 1H, 13C NMR and mass spectrometry are the experiments performed during the whole period to monitor the success of each synthetic step. The final compound are characterised by experiments of absorbance and luminescence, cyclic voltammetry and FT-IR. For a final compound it has been seen that present aggregation-induce emission. This a peculiar phenomenon for which a compound shows luminescence in solid state. To measure this feature it was performed an experiment of emission on solutions with a different concentration in volume of a good and a bad solvent. It has been seen that the increasing of the bad solvent (and so the increasing of aggregation) is related with the increase in intensity of luminescence.