Below the urbach edge: solar cell loss analysis based on full external quantum efficiency spectra

0574647 - FZÚ 2024 RIV US eng J - Journal Article
Holovský, Jakub - Ridzoňová, Katarína - Amalathas, A.P. - Conrad, B. - Sharma, R.K. - Chin, X.Y. - Bastola, E. - Bhandari, K. - Ellingson, R.J. - De Wolf, S.
Below the urbach edge: solar cell loss analysis based on full external quantum efficiency spectra.
ACS ENERGY LETTERS. Roč. 8, č. 7 (2023), s. 3221-3227. ISSN 2380-8195. E-ISSN 2380-8195
Institutional support: RVO:68378271
Keywords : solar cells * thermodynamic limit * external quantum efficiency * FTPS
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 22, year: 2022
Method of publishing: Open access

We suggest a new solar cell loss analysis by 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 this newly established 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.
Permanent Link: https://hdl.handle.net/11104/0346917