Ternary organic solar cells: using molecular donor or acceptor third components to increase open circuit voltage
NEW JOURNAL OF CHEMISTRY(2019)
Abstract
This report demonstrates that the open circuit voltage (V-OC) and power conversion efficiency (PCE) of polymer:fullerene (PBDB-T:PC60BM) organic solar cells can be simultaneously enhanced by introducing a molecular pi-conjugated donor or acceptor as a third component, thus affording high performance ternary blend devices. The use of a PDI-based acceptor "tPDI(2)N-hex" or benzothioxanthene-based donor "tBTI-IDT" as a third component leads to V-OC increases of 60 to 150 mV without significant loss in power conversion efficiency (PCE). The best solar cell PCE of 8.8% was achieved by doping the PBDB-T:PC60BM system with 10% by weight of tPDI(2)N-hex.
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Key words
ternary organic solar cells,molecular donor
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