How reliable are efficiency measurements of perovskite solar cells? the first inter-comparison, between two accredited and eight non-accredited laboratories

Ricky B. Dunbar*, Benjamin C. Duck, Tom Moriarty, Kenrick F. Anderson, Noel W. Duffy, Christopher J. Fell, Jincheol Kim, Anita Ho-Baillie, Doojin Vak, The Duong, YiLiang Wu, Klaus Weber, Alex Pascoe, Yi-Bing Cheng, Qianqian Lin, Paul L. Burn, Ripon Bhattacharjee, Hongxia Wang, Gregory J. Wilson

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Perovskite materials have generated significant interest from academia and industry as a potential component in next-generation, high-efficiency, low-cost, photovoltaic (PV) devices. The record efficiency reported for perovskite solar cells has risen rapidly, and is now more than 22%. However, due to their complex dynamic behaviour, the process of measuring the efficiency of perovskite solar cells appears to be much more complicated than for other technologies. It has long been acknowledged that this is likely to greatly reduce the reliability of reported efficiency measurements, but the quantitative extent to which this occurs has not been determined. To investigate this, we conduct the first major inter-comparison of this PV technology. The participants included two labs accredited for PV performance measurement (CSIRO and NREL) and eight PV research laboratories. We find that the inter-laboratory measurement variability can be almost ten times larger for a slowly responding perovskite cell than for a control silicon cell. We show that for such a cell, the choice of measurement method, far more so than measurement hardware, is the single-greatest cause for this undesirably large variability. We provide recommendations for identifying the most appropriate method for a given cell, depending on its stabilisation and degradation behaviour. The results of this study suggest that identifying a consensus technique for accurate and meaningful efficiency measurements of perovskite solar cells will lead to an immediate improvement in reliability. This, in turn, should assist device researchers to correctly evaluate promising new materials and fabrication methods, and further boost the development of this technology.

Original languageEnglish
Pages (from-to)22542-22558
Number of pages17
JournalJournal of Materials Chemistry A
Volume5
Issue number43
DOIs
Publication statusPublished - 21 Nov 2017
Externally publishedYes

Bibliographical note

Copyright the Publisher 2017. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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