Project Details
Projekt
PERovskite deFECTs: Physics, eVolution and Stability
Subject Area
Experimental Condensed Matter Physics
Synthesis and Properties of Functional Materials
Synthesis and Properties of Functional Materials
Term
since 2019
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 424216076
Defects in metal halide perovskites for photovoltaics are a topic of intense interest and scrutiny. While metal halide perovskites are generally categorized as ‘defect tolerant’, significant efforts are dedicated to suppressing defects in perovskite materials in order to improve the photovoltaic efficiency and stability of perovskite solar cells. This, seemingly contradicting, practice highlights the gaps in the fundamental understanding of the nature of defects in perovskite materials. In the first funding period of the project , we focused on identifying the spectroscopic signature of ionic defects by purposefully and systematically introducing them into the perovskite structure and investigating them by different types of defect spectroscopy. In the second period, we aim at deepening our knowledge of the thermodynamic properties of ionic defects in perovskite semiconductors, by transferring the developed methodology to the study of the impact of microstructure, in particular grain size in 3D perovskites, and dimensionality, considering 2D and quasi-2D perovskites, which are becoming increasingly relevant for photovoltaics and light-emitting applications. Furthermore, we will investigate the relationship between the properties of the ionic defects to the solar cell parameters and hysteresis behavior in high-efficiency perovskite solar cells by identifying the impact of ionic defects on device physics and energetics. Finally, we will investigate how defect properties are related to device degradation upon exposure to environmental factors, light and elevated temperatures. To summarize, in the second phase of , we will apply a complementary combination of methods, including time-resolved, spatially-resolved and temperature dependent electronic and optical spectroscopies to obtain a clear physical picture of the role of defects in perovskite solar cells for the photovoltaic performance and stability.
DFG Programme
Priority Programmes
