Proceedings of nanoGe International Conference on Perovskite Solar Cells, Photonics and Optoelectronics (NIPHO19)
DOI: https://doi.org/10.29363/nanoge.nipho.2019.067
Publication date: 21st November 2018
Photo-luminescence (PL) of the perovskite is a sensitive optical property directly linked to the performance of solar cells. Although it has been traditionally used to probe and monitor carrier recombination under laser excitation, photovoltaic operation intuitively implies the sun for photo-excitation. For this reason, we have developed a new confocal spectroscopy configuration with concentrated sunlight excitation. This setup may be used for in-situ monitoring of the accelerated photo-degradation of perovskite materials.
Here, we report on the first in-situ PL monitoring of methylamonium lead iodide thin films upon with excitation by concentrated sunlight up to 90 suns. We have observed distinctly different PL kinetics (the change of PL intensity under continuous illumination in timescales of seconds to minutes) under the sunlight compared to that under the laser excitation with similar power density. In this way, the new setup represents itself a very powerful tool for studying of the perovskite materials and devices.
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