Issue 11, 2018

Blue and red wavelength resolved impedance response of efficient perovskite solar cells

Abstract

The identification of recombination centers in perovskite solar cells is highly challenging. Here, we demonstrate the red and blue excitation wavelength resolved impedance response in state-of-the-art perovskite solar cells (PSCs) providing insights into charge recombination and ion accumulation. To get insight into the interfacial electronic characteristics, we fabricated PSCs with a planar architecture containing state-of-the-art triple-cation perovskite materials as absorber layers. The capacitance–frequency response under various blue and red illumination conditions were used to investigate interfacial charge accumulations and found that under high energy photons irradiation maximum charge or ion accumulations at interface (ETL/perovskite) take place. Ideality factor of PSCs was also calculated from the obtained value of high frequency resistance equaling 2.1 and 1.8 for devices measured under blue and red excitation wavelength, respectively. Our study illustrates that EIS measurements at different excitation wavelengths, reveals information about charge or ion accumulation and also provides a tool to diagnose PSCs in a more localized way.

Graphical abstract: Blue and red wavelength resolved impedance response of efficient perovskite solar cells

Supplementary files

Article information

Article type
Communication
Submitted
15 jun 2018
Accepted
05 aug 2018
First published
06 aug 2018

Sustainable Energy Fuels, 2018,2, 2407-2411

Blue and red wavelength resolved impedance response of efficient perovskite solar cells

D. Prochowicz, M. M. Tavakoli, S. Turren-Cruz, K. Pandey, M. Saliba and P. Yadav, Sustainable Energy Fuels, 2018, 2, 2407 DOI: 10.1039/C8SE00280K

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