Journal of Materials Chemistry A · 2013 · 45 citations · 29 references
EngineeringOrganic ElectronicsOrganic Solar CellOrganic ChemistryChemistryPhotovoltaicsNew Hole-extraction MaterialsSolar Cell StructuresHybrid MaterialsNew Interfacial MaterialsMaterials ScienceHole MobilitiesOrganic SemiconductorOrganic Material ChemistryElectronic MaterialsConjugated PolymerSolar CellsFunctional MaterialsTbdi HelSolar Cell Materials
Two new hole-extraction materials, TPDI (5,10,15-triphenyl-5H-diindolo[3,2-a:3′,2′-c]carbazole) and TBDI (5,10,15-tribenzyl-5H-diindolo[3,2-a:3′,2′-c]carbazole), were synthesized and explored in planar heterojunction organic solar cells (OSCs). The synthesized materials have good transparency in the visible spectrum, high hole mobility, and compatible highest occupied molecular orbital (HOMO) values with the donor material, which make them excellent hole-extraction layers (HELs) for OSCs. The SubPc (subphthalocyanine chloride)/C60 and SubNc (subnaphthalocyanine chloride)/C60 OSCs with a TBDI HEL show impressive 35.9% and 29.1% improvements in power conversion efficiencies compared to reference devices. Their HOMO values were evaluated as 5.2–5.3 eV and hole mobilities were measured as 5.9–6.1 × 10−3 cm2 V−1 s−1 at 0.3 MV cm−1 by the space-charge limited current method.
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Tandem polymer solar cells featuring a spectrally matched low-bandgap polymer
Letian Dou, Jingbi You, Jun Yang et al. · Nature Photonics · 2012 · 1.4K citations