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Blue and Red Wavelength Resolved Impedance Response of Efficient Perovskite Solar Cells

Abstract

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.

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Publication details

The article was received on 15 Jun 2018, accepted on 05 Aug 2018 and first published on 06 Aug 2018


Article type: Communication
DOI: 10.1039/C8SE00280K
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Blue and Red Wavelength Resolved Impedance Response of Efficient Perovskite Solar Cells

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

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