Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Organic-inorganic hybrid perovskites are currently the most promising materials for the next generation solar cells (PSCs) due to their excellent photovoltaic performances, such as high absorption coefficient, high charge carrier mobility, and long diffusion length. Despite the rapid improvement in power conversion efficiency (PCE) for perovskite solar cells in recent years, the effect on the performance induced by electrical processes, such as charge carrier recombination, charge transfer through interfaces and transport processes, are not fully understood or taken into account. Impedance Spectroscopy is one of the most useful technique to acquire a wide amount of information about the different mechanisms occurring in electric and optoelectronic devices, particularly useful when these phenomena present different characteristic times.[1] In this work, we analyze several PSCs with different electron selective contact configurations, through Current Density-Voltage Curves(JV), Cyclic Voltammetry and Impedance Spectroscopy (IS) measurements. We propose an electrical equivalent circuit to describe the characteristic impedance spectra of the PSCs measured. Cells with different thickness of the electron selective layers have been used to test this equivalent circuit and to analyze in detail their effect on the electrical response of the solar cell. Finally, we also identified how the different resistances used in the equivalent circuit model contribute to series or recombination processes and we show how they affect the JV curve and therefore the PSC performance parameters.[2]
MAESTRO project that has resulted in this poster has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 764787.
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