Pragmatic analysis of perovskite solar cells through a rationalized impedance spectroscopy equivalent circuit.
Pablo P Boix a, Ivan Mora Sero b
a Instituto de Ciencia de Materiales (ICMUV), Universidad de Valencia, Spain., Carrer del Catedrátic José Beltrán Martinez, 2, Paterna, Spain
b Universitat Jaume I, Institute of Advanced Materials (INAM) - Spain, Avinguda de Vicent Sos Baynat, Castelló de la Plana, Spain
Proceedings of International Conference on Impedance Spectroscopy and Related Techniques in Metal Halide Perovskites (PERIMPED)
Online, Spain, 2020 October 6th - 7th
Organizers: Juan Bisquert, Bruno Ehrler and Eline Hutter
Oral, Pablo P Boix, presentation 009
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.

© Fundació Scito
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info