KEYWORDS: Absorption, Solar cells, Luminescence, Organic photovoltaics, Binary data, Photovoltaics, Doping, Energy transfer, Active optics, Solar energy
In this study, we report the ternary organic solar cells by doping a thermally activated delayed fluorescence (TADF) material (4 s ,6 s )-2,4,5,6-tetra( 9H -carbazol-9-yl) isophthalonitrile (4CzIPN) in the binary poly(3-hexylthiophene) (P3HT) :[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) blends. Given the complementary absorption with P3HT, 4CzIPN was doped into (P3HT:PC71BM)-based binary blends, and ternary OSCs were developed, The ternary OSCs with 1.0 wt% of 4CzIPN displayed better phase separation of active layer, thus leading to an impressive efficiency of 3.94 % with open-circuit voltage of 0.54 V, short-circuit density of 11.58 mA/cm-2 and fill factor of 63.32%.
KEYWORDS: Solar cells, Solar energy, Polymers, Organic photovoltaics, Doping, Molecules, Resonance energy transfer, Photovoltaics, Absorption, Molecular energy transfer
In this work, we fabricated the ternary bulk hetero junction (BHJ) polymer solar cells (PSCs) by doping a phosphorescent small molecule bis[2-(4-tertbutylphenyl)benzothiazolato-N,C2′] iridium(acetylacetonate)[(tbt)2Ir(acac)] into the conventional active layer of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). After doping (tbt)2Ir(acac), the short circuit current and fill factor are simultaneously enhanced compared with binary device and the power conversion efficiency (PCE) of P3HT:PC71BM based ternary devices is improved from 2.99% to 4.14%. More excellent photovoltaic performance of ternary PSCs is mainly attributed to enhanced charge transportation by appropriate energy cascade alignment and enhanced exciton harvesting by Foerster resonance energy transfer from (tbt)2Ir(acac) to P3HT.
Fluorescence/phosphorescence hybrid white organic light-emitting devices (WOLEDs) with non-doped emitting layers are constructed based on blue, green and red dyes. The simplified emitting layers (EMLs) are fabricated with structure of Blue/Red/Blue/Green hybrid emitting layers consisting of an ultrathin non-doped green phosphorescence layer employing Tris(2-phenylpyridine)iridium (Ir(ppy)3), an ultrathin non-doped red phosphorescence layer using Tris(1-(4-hexylphenyl)-isoquinolinato-C2,N)iridium(III) (Ir(h-piq)3), and double non-doped blue thermally activated delayed fluorescence (TADF) layers using 9,9-dimethyl-9,10-dihydroacridine- diphenylsulfone (DMAC-DPS). A white OLED are fabricated with relatively stable electroluminescence spectra of white emission achieves maximum luminance, maximum current efficiency, power efficiency and external quantum efficiency of 21596cd/m2, 8.45 cd/A, 11.57 lm/W and 6%, respectively. The result shows a slight variation of Commission International de l’Eclairage (CIE) coordinates (0.026, 0.051) at a luminance ranging from 32 cd/m2 to 2728 cd/m2. It suggests that the bipolar charge carrier transport property of DMAC-DPS contributes to control of exciton recombination in the emissive regions and balance white emission.
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