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Reconsidering figures of merit for performance and stability of perovskite photovoltaics

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Abstract

The development of hybrid organic–inorganic halide perovskite solar cells (PSCs) that combine high performance and operational stability is vital for implementing this technology. Recently, reversible improvement and degradation of PSC efficiency have been reported under illumination–darkness cycling. Quantifying the performance and stability of cells exhibiting significant diurnal performance variations is challenging. We report the outdoor stability measurements of two types of devices showing either reversible photo-degradation or reversible efficiency improvement under sunlight. Instead of the initial (or stabilized) efficiency and T80 as the figures of merit for the performance and stability of such devices, we propose using the value of the energy output generated during the first day of exposure and the time needed to reach its 20% drop, respectively. The latter accounts for both the long-term irreversible degradation and the reversible diurnal efficiency variation and does not depend on the type of process prevailing in a given perovskite cell.

Graphical abstract: Reconsidering figures of merit for performance and stability of perovskite photovoltaics

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Publication details

The article was received on 14 Oct 2017, accepted on 05 Feb 2018 and first published on 05 Feb 2018


Article type: Opinion
DOI: 10.1039/C7EE02956J
Citation: Energy Environ. Sci., 2018, Advance Article
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    Reconsidering figures of merit for performance and stability of perovskite photovoltaics

    M. V. Khenkin, A. K. M., I. Visoly-Fisher, Y. Galagan, F. Di Giacomo, B. R. Patil, G. Sherafatipour, V. Turkovic, H. Rubahn, M. Madsen, T. Merckx, G. Uytterhoeven, J. P. A. Bastos, T. Aernouts, F. Brunetti, M. Lira-Cantu and E. A. Katz, Energy Environ. Sci., 2018, Advance Article , DOI: 10.1039/C7EE02956J

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