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New cyclic and acyclic imidazole-based sensitizers for achieving highly efficient photoanodes for dye-sensitized solar cells by potential assisted method
摘要： A series of systematically tailored aryl acyclic (biphenyl, dye 1 and 2) and cyclic (phenanthrene, dye 3 and 4) and methyl-substituted (dye 5) imidazole derivatives were synthesized and characterized for dye-sensitized solar cells (DSSCs) application. Anisole ancillary donor was attached to -NH position in the imidazole center to obtain dye 2 and 4. Cyclic voltammetry and UV-visible studies of all the dyes indicate their suitability for DSSC application. Among the synthesized dyes, dye 4 having phenanthrene donor and anisole ancillary donor showed highest power conversion efficiency (PCE) of 7.16% (JSC = 13.07 mA/cm2, VOC = 0.831 V, FF = 0.659). Dye 2 displayed the highest electron lifetime in the conduction band of photoanode and hence the open circuit voltage of DSSC based on dye 2 was highest among the dyes studied (0.865 V). By using a novel potential assisted dye staining process, the dye loading on the photoanode is enhanced by 18% in 1h, which in turn enhanced the PCE to 8.10%.
关键词： DSSC,J-V characteristics,Imidazole,Phenanthrene,IPCE,Biphenyl
更新于2025-09-23 15:21:01
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Effect of Ir(pq)2acac doping on CBP in phosphorescence organic light-emitting diodes
摘要： Doping is one of the most powerful methods amongst the various performance improvement ways. Doping affects the energy levels of the host layer by the energy level of the dopant. This allows the energy bandgap to be adjusted to a desired level and thus generates light corresponding to that energy level. Alternatively, it can act as an energy barrier between the interfaces to change the flow of carriers. In this study, the voltage dependences of undoped and doped devices were observed. Bis(2-phenylquinoline) iridium(III) (acetylacetonate) (Ir(pq)2acac) was doped in 4,4'-N, N'-dicarbazole-biphenyl (CBP) as the emission layer. The light intensity changes with the doping concentration, and the efficiency was also studied. When a high voltage was applied, the effect of triplet-triplet annihilation (TTA) adversely affected the electron-hole recombination. we analyzed the optimal operating conditions and the effect of doping concentration on OLEDs.
关键词： bis(2-phenylquinoline) iridium(III) (acetylacetonate) (Ir(pq)2(acac)),OLEDs,4,4'-N,N'-dicarbazole-biphenyl (CBP),doping
更新于2025-09-16 10:30:52