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| Hauptseite > Publikationsdatenbank > Quantifying the Energy Losses in CsPbI 2 Br Perovskite Solar Cells with an Open-Circuit Voltage of up to 1.45 V |
| Hauptseite > Publikationsdatenbank > Quantifying the Energy Losses in CsPbI 2 Br Perovskite Solar Cells with an Open-Circuit Voltage of up to 1.45 V |
| Journal Article | FZJ-2022-03847 |
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2022
American Chemical Society
Washington, DC
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Please use a persistent id in citations: doi:10.1021/acsenergylett.2c01883
Abstract: CsPbI2Br perovskite solar cells (PSCs) have attracted muchinterest because of their thermodynamic stability, relatively stable cubicperovskite phase, and their potential as a top cell for tandem applications.However, the open-circuit voltage (VOC) reported to date is in most cases wellbelow the detailed balance (DB) limit for single-junction PSCs. Here, wedemonstrate that adding lead acetate to the CsPbI2Br precursor allows us tosubstantially reduce losses due to nonradiative recombination. Correspondingchampion devices reach a power conversion efficiency (η) of 16.7% and ahighest VOC value of 1.45 V, which represents 90% of the DB limit for singlejunctionPSCs at a bandgap of 1.89 eV. In order to disentangle thenonradiative recombination loss mechanisms, we quantify the origin of energylosses by calculating the radiative limit of the open-circuit voltage (VOCrad) andthe quasi-Fermi level splitting (QFLS) of perovskite films with and withoutother functional layers. We further analyze the strategies to reduce the residual losses in order to push the efficiency beyond the 90% theoretical limit.
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