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Enhanced performance of ternary organic solar cells with a wide bandgap acceptor as the third component
摘要： Two n-type organic semiconductor (n-OS) acceptors, C8-SF and Y-MODF, were designed and synthesized for application in organic solar cells (OSCs). C8-SF shows a lower lowest unoccupied molecular orbital (LUMO) energy level and lower bandgap with an absorption edge at 822 nm. Y-MODF possesses a relatively larger bandgap and higher LUMO and lower HOMO (highest occupied molecular orbital) energy levels than C8-SF. With the polymer PM6 as the donor, the OSC with C8-SF as the acceptor delivers a power conversion efficiency (PCE) of 11.59% with a lower open circuit voltage (Voc) of 0.787 V, while the device with Y-MODF as the acceptor exhibits a lower PCE of 8.63% but a higher Voc of 0.984 V benefiting from the higher LUMO of the Y-MODF acceptor. Then, a series of ternary OSCs were fabricated with PM6:C8-SF as the host system and Y-MODF as a third component. The optimal ternary OSCs with 25% Y-MODF incorporated into the acceptor achieve a higher PCE of 13.39%, with an improved Voc of 0.845 V, a Jsc of 20.88 mA cm?2 and a FF of 75.87%. It was found that adding Y-MODF to the PM6:C8-SF binary system suppressed monomolecular recombination and improved the utilization of 450–600 nm range photons. Molecular packing is further optimized with more balanced hole and electron transport, thus resulting in the enhanced Jsc and FF for the ternary OSCs. These results indicate that the addition of a wide bandgap acceptor with a higher LUMO energy level to a binary donor/acceptor system may have potential for Voc and PCE improvement of ternary OSCs.
关键词： ternary OSCs,n-type organic semiconductor,organic solar cells,open circuit voltage,power conversion efficiency
更新于2025-09-16 10:30:52
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Functionalized and reduced graphene oxide as hole transport layer and for use in ternary organic solar cell
摘要： Here is reported the performance of organic solar cells (OSCs) by using a new graphene oxide derivative as hole transport layer (HTL). OSCs are based on the PTB7:PC71BM blend as active layer and the alternative top electrode Field’s metal (Bi/In/Sn: 32.5%, 51%, 16.5%), which can be easily deposited through a vacuum-free process at regular atmosphere and low temperature (90°C). Graphene oxide (GO) was chemically functionalized and reduced with pentafluorophenylhydrazine, this fluorinated reduced graphene oxide (F5-rGO) was suspended in dimethylformamide for easy deposit by wet techniques such as spin-cast. F5-rGO has a work-function of 5.1 eV due to the high electronegativity of fluorine atoms incorporated into the GO sheets. The best achieved PCE of the OSCs fabricated for a single layer of F5-rGO was 5.82%. An enhanced PCE of 7.67% when F5-GO was used as interlayer between ITO and PEDOT:PSS was reached (PCE of PEDOT:PSS-based was 7.29%). Additionally, functionalized and reduced (chemically) graphene oxide (H5-rGO) was also obtained from GO treated with phenylhydrazine, and ternary OSCs were also prepared by adding H5-rGO to the PTB7:PC71BM blend at different weight ratios: 0, 3, and 6%. The best results were achieved with 3% of H5-rGO: OSCs presented a PCE of 7.56%.
关键词： Functionalized-reduced graphene oxide,PTB7:PC71BM,Hole transport layer,Ternary OSCs,Organic solar cells
更新于2025-09-11 14:15:04