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Reply to 'Tandem organic solar cells revisited'

: Timmreck, R.; Meyer, T.; Gilot, J.; Seifert, H.; Mueller, T.; Furlan, A.; Wienk, M.M.; Wynands, D.; Hohl-Ebinger, J.; Warta, W.; Janssen, R.A.J.; Riede, M.; Leo, K.


Nature photonics 10 (2016), No.6, pp.355
ISSN: 1749-4885
ISSN: 1749-4893
Journal Article
Fraunhofer ISE ()

In our recent Correspondence (Nature Photon. 9, 478–479; 2015), we presented a set of general rules for characterizing tandem organic solar cells to achieve reliable and comparable device performance data, especially cell efficiencies.
In a reply to our Correspondence, Bahro et al. (Nature Photon. 10, 354–355; 2016) present a useful supplement to our analysis. They provide external quantum efficiency (EQE) data for an organic tandem solar cell without bias illumination, showing a case where the cell's EQE does not follow the lower envelope of the EQE spectra of the two subcells due to the specific intensity of the probe light. We agree that this can be a practically relevant issue when one of the subcells has a low shunt resistance and thank Bahro et al. for pointing this out.
Furthermore, Bahro et al. comment on rule 3 of our general rules for characterizing tandem organic solar cells. They point out that when the EQE of a tandem cell without bias illumination is not following the lower envelope of the subcells' EQEs, measurements under bias light can deliver a correct result in certain cases. Actually, we feel we have already covered this circumstance, albeit not highlighted specifically, in our Supplementary Information (in the last paragraph of Supplementary Section 3.1). For the purposes of simplicity and transparency, we suggest to keep rule 3 unchanged. Our Supplementary Information combined with the reply of Bahro et al. make the correct characterization procedures clear.