The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance

Sirtl, Maximilian T.; Ebadi, Firouzeh; van Gorkom, Bas T.; Ganswindt, Patrick; Janssen, René A. J.; Bein, Thomas; Tress, Wolfgang

doi:10.1002/adom.202100202

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-22734

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance
Authors:	Sirtl, Maximilian T. Ebadi, Firouzeh van Gorkom, Bas T. Ganswindt, Patrick Janssen, René A. J. Bein, Thomas Tress, Wolfgang
et. al:	No
DOI:	10.1002/adom.202100202 10.21256/zhaw-22734
Published in:	Advanced Optical Materials
Volume(Issue):	9
Issue:	14
Page(s):	2100202
Issue Date:	21-Jun-2021
Publisher / Ed. Institution:	Wiley
ISSN:	2195-1071
Language:	English
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	Cs2AgBiBr6 has attracted much interest as a potential lead-free alternative for perovskite solar cells. Although this material offers encouraging optoelectronic features, severe bottlenecks limit the performance of the resulting solar cells to a power conversion efficiency of below 3%. Here, the performance-limiting factors of this material are investigated in full solar cells featuring various architectures. It is found that the photovoltaic parameters of Cs2AgBiBr6-based solar cells strongly depend on the scan speed of the J/V measurements, suggesting a strong impact of ionic conductivity in the material. Moreover, a sign change of the photocurrent for bias voltages above 0.9 V during the measurement of the external quantum efficiency (EQE) is revealed, which can be explained by non-selective contacts. The radiative loss of the VOC from sensitive subgap-EQE measurements is calculated and it is revealed that the loss is caused by a low external luminescence yield and therefore a high non-radiative recombination, supported by the first report of a strongly red shifted electroluminescence signal between 800 and 1000 nm. Altogether, these results point to a poor selectivity of the contacts and charge transport layers, caused by poor energy level alignment that can be overcome by optimizing the architecture of the solar cell.
URI:	https://digitalcollection.zhaw.ch/handle/11475/22734
Fulltext version:	Published version
License (according to publishing contract):	CC BY-NC 4.0: Attribution - Non commercial 4.0 International
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Published as part of the ZHAW project:	Modellierung und Charakterisierung von neuartigen optoelektronischen Bauelementen
Appears in collections:	Publikationen School of Engineering

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Sirtl, M. T., Ebadi, F., van Gorkom, B. T., Ganswindt, P., Janssen, R. A. J., Bein, T., & Tress, W. (2021). The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance. Advanced Optical Materials, 9(14), 2100202. https://doi.org/10.1002/adom.202100202

Sirtl, M.T. et al. (2021) ‘The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance’, Advanced Optical Materials, 9(14), p. 2100202. Available at: https://doi.org/10.1002/adom.202100202.

M. T. Sirtl et al., “The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance,” Advanced Optical Materials, vol. 9, no. 14, p. 2100202, Jun. 2021, doi: 10.1002/adom.202100202.

SIRTL, Maximilian T., Firouzeh EBADI, Bas T. VAN GORKOM, Patrick GANSWINDT, René A. J. JANSSEN, Thomas BEIN und Wolfgang TRESS, 2021. The bottlenecks of Cs2AgBiBr6 solar cells : how contacts and slow transients limit the performance. Advanced Optical Materials. 21 Juni 2021. Bd. 9, Nr. 14, S. 2100202. DOI 10.1002/adom.202100202

Sirtl, Maximilian T., Firouzeh Ebadi, Bas T. van Gorkom, Patrick Ganswindt, René A. J. Janssen, Thomas Bein, and Wolfgang Tress. 2021. “The Bottlenecks of Cs2AgBiBr6 Solar Cells : How Contacts and Slow Transients Limit the Performance.” Advanced Optical Materials 9 (14): 2100202. https://doi.org/10.1002/adom.202100202.

Sirtl, Maximilian T., et al. “The Bottlenecks of Cs2AgBiBr6 Solar Cells : How Contacts and Slow Transients Limit the Performance.” Advanced Optical Materials, vol. 9, no. 14, June 2021, p. 2100202, https://doi.org/10.1002/adom.202100202.