In order to supply the growing demand of electricity consumption of the last decades, the use of renewable energies, such as photovoltaic cells - solar cells (SC) - have emerged as promising way to clean, renewable and efficient energy to reduce the use of fossil fuels, non-renewable and polluting. Brazil, for its location and territorial extension, receives solar energy of about 1013 MWh per year, which corresponds to approximately 50,000 times the annual electricity consumption. Thus, the development of devices that convert sunlight into electricity using efficient, low-cost and new materials have arised interest in the international scientific community. In this context, the perovskite solar cells have shown increasing efficiency values. Hence, the synthesis of novel compounds is a crucial tool to promote structural modifications and improve their properties, aiming to increase efficiency of energy conversion. The most common material used as hole transport in this kind of device, the spiro-O-MeTAD, has been presented as a bottleneck to develop cheap and stable devices, since it has commercial value ten times higher than Au and Pt, and is unstable to atmospheric oxygen. Thus, in this project we propose to perform the synthesis of donor-À-acceptor anchoring groups covalently bonded to compounds derived from carbon conductors such as graphene films and powders for use as hole transport material (HTM) in perovskite devices. These new compounds will be structurally, electrically and photochemically analyzed. Assembly and characterization of devices is expected to be made in a period abroad (BEPE) in collaboration with Prof. Alan Sellinger's group at the Colorado School of Mines (CSM). It is also intended to study the effect of the structural changes made to the molecule in relation to different types of ligands and its substituents in specific positions to observe responses in the ratio and yield of the products formed in the reaction times and performance of the devices. In addition, the synthesized molecules will be also tested to verify potential applications in other organic electronic devices.
News published in Agência FAPESP Newsletter about the scholarship: