Below the Urbach Edge: Solar Cell Loss Analysis Based on Full External Quantum Efficiency Spectra

Below the Urbach Edge: Solar Cell Loss Analysis Based on Full External Quantum Efficiency Spectra

We suggest a new solar cell loss analysis using the external quantum efficiency (EQE) measured with sufficiently high sensitivity to also account for defects. Unlike common radiative-limit methods, where the impact of deep defects is ignored by exponential extrapolation of the Urbach absorption edge...

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Veröffentlicht in:ACS energy letters 2023-07, Vol.8 (7), p.3221-3227
Hauptverfasser: Holovský, Jakub, Ridzoňová, Katarína, Peter Amalathas, Amalraj, Conrad, Brianna, Sharma, Rupendra Kumar, Chin, Xin Yu, Bastola, Ebin, Bhandari, Khagendra, Ellingson, Randy J., De Wolf, Stefaan
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container_end_page 3227
container_issue 7
container_start_page 3221
container_title ACS energy letters
container_volume 8
creator Holovský, Jakub
Ridzoňová, Katarína
Peter Amalathas, Amalraj
Conrad, Brianna
Sharma, Rupendra Kumar
Chin, Xin Yu
Bastola, Ebin
Bhandari, Khagendra
Ellingson, Randy J.
De Wolf, Stefaan
description We suggest a new solar cell loss analysis using the external quantum efficiency (EQE) measured with sufficiently high sensitivity to also account for defects. Unlike common radiative-limit methods, where the impact of deep defects is ignored by exponential extrapolation of the Urbach absorption edge, our loss analysis considers the full EQE including states below the Urbach edge and uses corrections for band-filling and light-trapping. We validate this new metric on a whole range of photovoltaic materials and verify its accuracy by electrical simulations. Any deviations between the new metric and experimental open-circuit voltage are due to the presence of spatially localized defects and are explained as violations of the assumption of flat quasi-Fermi levels through the device.
doi_str_mv 10.1021/acsenergylett.3c00951
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