Publication date: 25th September 2020
Impedance spectroscopy has been a key technique to unveil the working mechanism of new generation photovoltaics, from sensitized to bulk heterojunction solar cells. One of the main reasons for its success was the use of equivalent circuits which gave access to important device information, such as charge recombination or transport, in a semi-direct way.
However, an unambiguous impedance spectroscopy model for perovskite solar cells with a straightforward equivalent circuit has remained elusive, often resulting in contradictory interpretations of the results.
We present an equivalent circuit derived from the study of a series of model systems: from a dye-sensitized configuration, where all the impedance features are well-known, to a state-of-the art perovskite solar cell [1]. This approach identifies the main impedance attributes in the perovskite-based devices, and explains the particularities including the Nyquist arcs coupling and the role of the low frequency capacitance. Concurrently, it can characterize the main physical processes determining the photovoltaic performance in a pragmatical way. The model shows its perks when applied to otherwise unintelligible cases, as a tool to unveil recombination or transport limitations. The potential and current limitations will be discussed.
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