Samenvatting
The efficiency of perovskite solar cells is affected by open-circuit voltage losses due to radiative and non-radiative charge recombination. When estimated using sensitive photocurrent measurements that cover the above- and sub-bandgap regions, the radiative open-circuit voltage is often unphysically low. Here we report sensitive photocurrent and electroluminescence spectroscopy to probe radiative recombination at sub-bandgap defects in wide-bandgap mixed-halide lead perovskite solar cells. The radiative ideality factor associated with the optical transitions increases from 1, above and near the bandgap edge, to ~2 at mid-bandgap. Such photon energy-dependent ideality factor corresponds to a many-diode model. The radiative open-circuit voltage limit derived from this many-diode model enables differentiating between radiative and non-radiative voltage losses. The latter are deconvoluted into contributions from the bulk and interfaces via determining the quasi-Fermi level splitting. The experiments show that while sub-bandgap defects do not contribute to radiative voltage loss, they do affect non-radiative voltage losses.
Originele taal-2 | Engels |
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Artikelnummer | 1276 |
Aantal pagina's | 10 |
Tijdschrift | Nature Communications |
Volume | 15 |
Nummer van het tijdschrift | 1 |
DOI's | |
Status | Gepubliceerd - 10 feb. 2024 |
Bibliografische nota
Publisher Copyright:© 2024. The Author(s).
Financiering
The authors are grateful for fruitful discussions with Thomas Kirchartz (Forschungszentrum Jülich, Germany) regarding the radiative ideality factor. We acknowledge funding from the Netherlands Ministry of Education, Culture, and Science (Gravity program 024.001.035) (T.P.A.v.d.P., R.A.J.J.) and the Netherlands Organization for Scientific Research (NWO) for funding through the Joint Solar Programme III (project 680.91.011) (K.D., R.A.J.J.) and the Spinoza prize (G.J.W.A., W.H.M.R., M.M.W., R.A.J.J.).
Financiers | Financiernummer |
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Ministerie van OCW | 024.001.035 |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek | 680.91.011 |