Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep06071
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Funding
- European Union's Seventh Framework Programme FP7 under the REA [PIEF-GA-2012-327199]
- Bavarian Ministry of Economic Affairs and Media, Energy and Technology
- Bavarian State Ministry of Education and Culture, Science and Arts within the Collaborative Research Network Solar Technologies go Hybrid
- UK Engineering and Physical Sciences Research Council
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2011 24594]
- Generalitat Valenciana [Prometeo/2012/053]
- EPSRC [EP/G049653/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G049653/1] Funding Source: researchfish
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The maximum efficiency of any solar cell can be evaluated in terms of its corresponding ability to emit light. We herein determine the important figure of merit of radiative efficiency for Methylammonium Lead Iodide perovskite solar cells and, to put in context, relate it to an organic photovoltaic (OPV) model device. We evaluate the reciprocity relation between electroluminescence and photovoltaic quantum efficiency and conclude that the emission from the perovskite devices is dominated by a sharp band-to-band transition that has a radiative efficiency much higher than that of an average OPV device. As a consequence, the perovskite have the benefit of retaining an open circuit voltage similar to 0.14 V closer to its radiative limit than the OPV cell. Additionally, and in contrast to OPVs, we show that the photoluminescence of the perovskite solar cell is substantially quenched under short circuit conditions in accordance with how an ideal photovoltaic cell should operate.
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