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首页> 外文期刊>Thin Solid Films >Photoinduced charge and energy transfer in dye-doped conjugated polymers
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Photoinduced charge and energy transfer in dye-doped conjugated polymers

机译：染料掺杂共轭聚合物中的光诱导电荷和能量转移

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摘要

Conjugated polymer-molecular dye blends of MDMO-PPV (poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene]) and PF1CVTP (pory[9,9-dioctylfluorene-2,7-diyl-alt-2,5-bis(2-thienyl-1 -cyanovinyl)-1 -(3′,7′-dimethyloctyloxy)-4-methoxybenzene-5″,5″-diyl]) with three dipyrrometheneboron difluoride (bodipy) dyes were studied by (time-resolved) fluorescence and photoinduced absorption spectroscopy to determine quantitatively the relation between the electronic HOMO and LUMO levels and the occurrence of energy or charge transfer after optical excitation. We find that for MDMO-PPV photoinduced charge transfer to the dyes occurs, while photoexcitation of PF1CVTP exclusively results in energy transfer. The differences can be rationalized by assuming that the energy of the charge separated state is 0.33-0.45 eV higher than the energy determined from oxidation and reduction potentials of donor and acceptor, respectively. This provides an important design rule to identify appropriate materials for polymer solar cells that can have a high open-circuit voltage.
机译：MDMO-PPV（聚[2-甲氧基-5-（3'，7'-二甲基辛氧基）-1,4-亚苯基亚乙烯基]）和PF1CVTP（多孔[9,9-二辛基芴-2,7]的共轭聚合物-分子染料混合物-二基-alt-2,5-双（2-噻吩基-1-氰基乙烯基）-1-（3'，7'-二甲基辛氧基）-4-甲氧基苯-5“，5”-二基]）和三氟化二吡咯甲基硼（通过（时间分辨）荧光和光诱导吸收光谱研究了bodipy染料，以定量确定电子HOMO和LUMO水平与光激发后能量或电荷转移的发生之间的关系。我们发现，对于MDMO-PPV，发生光诱导的电荷转移到染料，而PF1CVTP的光激发仅导致能量转移。可以假设电荷分离状态的能量比分别由施主和受主的氧化和还原电势确定的能量高0.33-0.45 eV，从而使差异合理化。这提供了重要的设计规则，以识别适用于具有高开路电压的聚合物太阳能电池的材料。

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