Almantas Pivrikas

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Bimolecular charge carrier recombination has been clarified in bulk-heterojunction solar cells based on a blend of regioregular poly(3-hexylthiophene) and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene using the time-of-flight method. We show how bimolecular recombination influences the charge carrier transport, how it limits the efficiency of(More)
Light harvesting systems based upon disordered materials are not only widespread in nature, but are also increasingly prevalent in solar cells and photodetectors. Examples include organic semiconductors, which typically possess low charge carrier mobilities and Langevin-type recombination dynamics--both of which negatively impact the device performance. It(More)
Charge carrier recombination is studied in operational organic solar cells made from the polymer:fullerene system PCDTBT:PC71BM (poly[N-9''-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)]: [6,6]-phenyl-C70-butyric acid methyl ester). A newly developed technique High Intensity Resistance dependent PhotoVoltage is presented(More)
A typical signature of charge extraction in disordered organic systems is dispersive transport, which implies a distribution of charge carrier mobilities that negatively impact on device performance. Dispersive transport has been commonly understood to originate from a time-dependent mobility of hot charge carriers that reduces as excess energy is lost(More)
In regioregular poly(3-hexylthiophene) /1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-methanofullerene (RR P3HT/PCBM) bulk heterojunction structures the recombination features of photogenerated and of double injection charge carriers are compared. The investigations have been made using time-of-flight (TOF), charge extraction by linearly increasing voltage(More)
To the Editor — Grancini et al. reported that “hot [charge transfer state] dissociation produces an overall increase in the charge generation yield” in organic solar cells (OSCs)1. If true, this is an important result as the process could dramatically improve efficiencies. Hot excitons are a ‘hot’ topic2,3, but was the increase in internal quantum(More)
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