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Issue 15, 2018
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Influence of a cobalt additive in spiro-OMeTAD on charge recombination and carrier density in perovskite solar cells investigated using impedance spectroscopy

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Abstract

The role of additives in spiro-OMeTAD as a hole transport material (HTM) has been found to be vitally important for achieving decent photovoltaic performance of perovskite solar cells (PSCs). Four spiro-OMeTAD recipes with controlled concentrations of additives are studied in the context of PSCs. It is found that a small change in the concentration of additives results in a huge difference in the overall power conversion efficiency, which stems from the distinct charge extraction process in PSCs. Furthermore, the effect of the third additive, a cobalt complex (FK102, Co(III)TFSI), on the carrier density and charge recombination in PSCs is extensively investigated. It is found that the presence of the cobalt additive can significantly improve the photovoltaic performance of PSCs via the suppression of charge recombination at the interface of the perovskite layer and the HTM layer, which leads to a more than doubled power conversion efficiency.

Graphical abstract: Influence of a cobalt additive in spiro-OMeTAD on charge recombination and carrier density in perovskite solar cells investigated using impedance spectroscopy

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Publication details

The article was received on 01 Jan 2018, accepted on 01 Mar 2018 and first published on 07 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00008E
Citation: Phys. Chem. Chem. Phys., 2018,20, 10114-10120
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    Influence of a cobalt additive in spiro-OMeTAD on charge recombination and carrier density in perovskite solar cells investigated using impedance spectroscopy

    Q. Wang, Phys. Chem. Chem. Phys., 2018, 20, 10114
    DOI: 10.1039/C8CP00008E

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