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• W2471043867 abstract "Abstract A strategy for increasing the conversion efficiency of organic photovoltaics has been to increase the V OC by tuning the energy levels of donor and acceptor components. However, this opens up a new loss pathway from an interfacial charge transfer state to a triplet exciton (TE) state called electron back transfer (EBT), which is detrimental to device performance. To test this hypothesis, we study triplet formation in the high performing PTB7:PC 71 BM blend system and determine the impact of the morphology-optimizing additive 1,8-diiodoctane (DIO). Using photoluminescence and spin-sensitive optically detected magnetic resonance (ODMR) measurements at low temperature, we find that TEs form on PC 71 BM via intersystem crossing from singlet excitons and on PTB7 via EBT mechanism. For DIO blends with smaller fullerene domains, an increased density of PTB7 TEs is observed. The EBT process is found to be significant only at very low temperature. At 300 K, no triplets are detected via ODMR and electrically detected magnetic resonance on optimized solar cells indicates that TEs are only present on the fullerenes. We conclude that in PTB7:PC 71 BM devices, TE formation via EBT is impacted by fullerene domain size at low temperature, but at room temperature, EBT does not represent a dominant loss pathway." @default.
• W2471043867 created "2016-07-22" @default.
• W2471043867 creator A5002643130 @default.
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• W2471043867 date "2016-07-06" @default.
• W2471043867 modified "2023-10-18" @default.
• W2471043867 title "Analysis of Triplet Exciton Loss Pathways in PTB7:PC71BM Bulk Heterojunction Solar Cells" @default.
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• W2471043867 doi "https://doi.org/10.1038/srep29158" @default.
• W2471043867 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4933975" @default.
• W2471043867 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27380928" @default.
• W2471043867 hasPublicationYear "2016" @default.
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