Understanding charge extraction and recombination losses in perovskite solar cells

The performance of perovskite solar cells is mainly limited by two mechanisms – inefficient charge extraction through the low-mobility transport layers and non-radiative recombination via defects at interfaces. In this talk, I will explain how to characterize these loss mechanisms using a combination of luminescence and optoelectronic measurements, both in the time and frequency domain. Through the development of analytical/semi-analytical models in combination with full drift-diffusion simulations, we develop data analysis methods that allow determination of characteristic parameters related to these loss mechanisms. In this regard, I will summarize our results regarding the determination of defect densities using capacitance measurements, and the analysis of measured time constants to determine charge extraction losses in the perovskite solar cell.