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Molecular approaches to third generation photovoltaics:Photochemical up-conversion

机译:第三代光伏的分子方法:光化学上转换

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We have investigated a photochemical up-conversion system comprising a molecular mixture of a palladium porphyrin to harvest light, and a polycyclic aromatic hydrocarbon to emit light. The energy of harvested photons is stored as molecular triplet states which then annihilate to bring about up-converted fluorescence. The limiting efficiency of such triplet-triplet annihilation up-conversion has been believed to be 11% for some time. However, by rigorously investigating the kinetics of delayed fluorescence following pulsed excitation, we demonstrate instantaneous annihilation efficiencies exceeding 40%, and limiting efficiencies for the current system of m 60%. We attribute the high efficiencies obtained to the electronic structure of the emitting molecule, which exhibits an exceptionally high Ti molecular state. We utilize the kinetic data obtained to model an up-converting layer irradiated with broadband sunlight, finding that « 3% efficiencies can be obtained with the current system, with this improving dramatically upon optimization of various parameters.
机译:我们已经研究了一种光化学上转换系统,该系统包含钯卟啉的分子混合物以捕获光,而多环芳烃则发光。所收集的光子的能量以分子三重态存储,然后消灭以产生上转换的荧光。这种三重态-三重态an灭上转换的极限效率在一段时间内被认为是11%。但是,通过严格研究脉冲激发后延迟荧光的动力学,我们证明了瞬时an灭效率超过40%,而当前系统的效率限制为m 60%。我们将获得的高效率归因于发射分子的电子结构,该电子结构表现出异常高的Ti分子态。我们利用获得的动力学数据对宽带阳光照射的上转换层进行建模,发现使用当前系统可以获得«3%的效率,并且在优化各种参数后,效率得到了显着提高。

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