Effective organic solar cells rely on the ability to split photogenerated electron-hole pairs (so‑called excitons) at the interface between donor- and acceptor-type materials. Some organic materials exhibit efficient singlet fission, or singlet-to-two-triplets conversion, leading to the possibility of higher efficiencies than would otherwise be possible. Therefore, materials and methods are needed to utilize triplet excitons via their direct dissociation to charges at the interface.
The Optical Condensed Matter Physics group (the Zernike Institute for Advanced Materials), together with colleagues from Princeton University (USA) have demonstrated that triplet exciton harvesting in rubrene/C60 bilayer solar cells can be dramatically enhanced by tuning the morphology of the rubrene layer. Using a combination of time-resolved photoluminescence quenching technique, external quantum efficiency measurements and photoelectron spectroscopy they have shown that in amorphous rubrene/C60 system triplet harvesting is blocked, while after rubrene crystallization it becomes extremely efficient. The results obtained demonstrate the possibility of creating organic solar cells with quantum efficiency exceeding 100%.
Different from previous years but still surprising, fun, healthy, and for the whole family: join Groningen’s take on this year’s national weekend of science, organized by the University of Groningen (UG) and Hanze University of Applied Sciences...
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