Photo-induced Time Resolved Spectroscopy for the Determination of Carrier Density, Charge Recombination and Efficiency Losses in Perovskite solar cells.

摘要

During my lecture I will present our latest results on the characterization of different type of devices that include MAPI as light harvesting material using advanced photo-induced time resolved techniques. Using PICE (Photo-induced charge extraction), PIT-PV (Photo-induced Transient Photo Voltage) and other techniques, we have been able to distinguish between capacitive electronic charge, and a larger amount of charge due to the intrinsic properties of the perovskite material. Moreover, the results allow us to compare different materials, used as hole transport materials (HTM), and the relationship between their HOMO and LUMO energy levels, the solar cell efficiency and the charge losses due to interfacial charge recombination processes occurring at the device under illumination. These techniques and the measurements carried out are key to understand the device function and improve further the efficiency and stability on perovskite MAPI based solar cells.