Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.262
Publication date: 6th July 2018
The development of organic-inorganic lead halide perovskites with very large efficiency requires us to understand the operation of the solar cell. The application of frequency techniques is a major tool for the analysis of perovskite solar cells. Here we describe the general theory and methods of small perturbation frequency modulated techniques. These methods connect a broad range of experimental tools that interrogate the system in specific steady-state conditions.1 the first method we discuss is the simulation of the dynamic response of the perovskite/contact interface. Here we find that it is necessary to establish the main polarization conditions, and how they are coupled to recombination and charge transfer, eventually leading to a typical behaviour of negative capacitance. Secondly we investigate the physical meaning of light modulated techniques as IMPS and IMVS when applied to charge collection in perovskite solar cells. Third we introduce a light-to-light impedance that is able to provide information on phenomena of photon diffusion as in photon recycling regime.2
(1) Bertoluzzi, L.; Bisquert, J. Investigating the Consistency of Models for Water Splitting Systems by Light and Voltage Modulated Techniques, J. Phys. Chem. Lett. 2017, 8, 172-180.
(2) Ansari-Rad, M.; Bisquert, J. Theory of Light-Modulated Emission Spectroscopy, J. Phys. Chem. Lett. 2017, 8, 3673-3677.
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