DOI: https://doi.org/10.29363/nanoge.aohm.2019.040
Publication date: 8th January 2019
Thermally-activated delayed fluorescence (TADF) molecules can convert spin-triplet excitons into spin-singlet excitons due to its high-lying triplet energy level. This high-energy triplet, in the context of organic solar cells, can potentially suppress geminate recombination from charge-transfer (CT) states at electron-donating and electron-accepting interfaces. Here, we explored the use of a new class of organic molecules originally developed for OLEDs in OPV applications and utilized novel ultrafast photocurrent/photovoltage techniques, to probe the amplitude and kinetics of geminate and non-geminate recombination in working solar cells based on TADF molecules. Our initial result shows that, geminate recombination which dominants in short time scales is not severe and its kinetics can be controlled by the relative energy levels of CT and triplet states. Non-geminate recombination combined with mobility calculation showed that the major loss channel is through free electrons and trapped holes occurred in longer time scales. These observations showed implications to kinetically suppress recombination from low-lying triplet states in organic solar cells.
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