Time-resolved photoelectrochemical investigations of cathodic and anodic processes in perovskites
The consequences of increased power consumption, such as drastically rising CO2 levels, natural disasters, and environmental pollution have given reason, in particular, following the earthquake-tsunami disaster in Fukushima, to raise serious concerns about the supply of energy from fossil fuels and nuclear power. Being part of the development of environmentally clean and safe sustainable technologies, photovoltaics and photocatalysis, are attracting increasing attention. Hereby, the perovskites have become a front runner of the solar energy conversion research, and represent the fastest developing solar technology in history. Recently, the National Renewable Energy Laboratory (NREL) verified a perovskite solar cell with efficiency of 20%. Primarily, the research on perovskites is focused on the device development, while the underlying photophysical processes, which are equally important for the device improvement and for the understanding of the device operation, have been rarely investigated. Hence, in the proposed project we aim to study the charge carrier dynamics in perovskite powders and electrodes by means of the laser flash photolysis spectroscopy (LFPS). Moreover, owing to the combination of the photoelectrochemical set-up with LFPS it will be possible to observe time-resolved the anodic and the cathodic subprocesses, which take place in perovskite electrodes, separately from each other.