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|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.|
van Gorkom, Bas T.
Janssen, René A. J.
|Published in:||Advanced Optical Materials|
|Publisher / Ed. Institution:||Wiley|
|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.|
|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., 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.
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