Issue 4, 2018

Reconsidering figures of merit for performance and stability of perovskite photovoltaics

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

Supplementary files

Article information

Article type
Opinion
Submitted
14 10 2017
Accepted
05 2 2018
First published
05 2 2018
This article is Open Access
Creative Commons BY license

Energy Environ. Sci., 2018,11, 739-743

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, 11, 739 DOI: 10.1039/C7EE02956J

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