Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.096
Publication date: 18th July 2023
Perovskite solar cells are very efficient, but mobile ions currently hamper their long-term stability. Mobile ions drift and diffuse through the device during operation, driven for example by a light or voltage bias. Since perovskites are intrinsic semiconductors, these ions determine the electric field distribution in a perovskite-based device. However, it is not clear what this means for device operation. I will discuss the influence of the field screening on capacitance and photoluminescence measurements.
The capacitance value measured for a perovskite device depends on the doping level of the perovskite and the adjacent transport layers, and the ion distribution within the perovskite layer. The latter changes with voltage, temperature, and time, so that mobile ions influence all kinds of voltage, temperature, and time-dependent measurements in non-trivial ways. With capacitance measurements, many properties of mobile ions can be accessed, but only if we understand the way the transport layers and doping levels influence these measurements. I will present drift-diffusion simulations that explore this parameter space.
Photoluminescence measurements are also influenced by the local electric field. The presence of a field can lead to drift out of the PL collection zone, or change the local trap filling. Again, mobile ions determine the field, and the local photoluminescence is hence strongly influenced by their presence. I will show lateral device measurements that we use to attempt an understanding of the changes in photoluminescence in the presence of mobile ions.
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