Ultrafast and Long-Range Energy Transfer from Plasmon to Molecular Exciton
Ultrafast and Long-Range Energy Transfer from Plasmon to Molecular Exciton
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DOI：
10.1021/acs.jpcc.2c07921
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Fatimah Rudayni;Tika R. Kafle;Jack Waters;Kushal Rijal;W. Chan
中科院分区：
文献类型：
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作者：
Fatimah Rudayni;Tika R. Kafle;Jack Waters;Kushal Rijal;W. Chan
利用金属光栅和酞菁锌（ZnPc）分子组成的模型界面，通过等离子体激元诱导的共振能量转移机制，在时间和空间上解析了等离子体激元到分子激子的能量转移过程.结果表明，对于20 nm的距离，能量转移可以在30 fs内发生。能量转移范围远大于典型的热载流子转移和分子到分子的能量转移过程。因此，这种超快和长程等离子体激元诱导的能量转移通道对于提高半导体层中的激子/自由载流子产生产率特别有用。此外，激子产率的提高不会减少，即使当光子能量降低朝向ZnPc的光吸收边。因此，观察到的能量转移过程可以将光学吸收扩展到低于分子的光学带隙的频率。
By using a model interface consisting of a metallic grating and zinc phthalocyanine (ZnPc) molecules, we temporally and spatially resolve the energy transfer process from plasmon to molecular exciton via the plasmon-induced resonance energy transfer mechanism. It is found that the energy transfer can occur within 30 fs for a distance of 20 nm. The energy transfer range is much larger than that of typical hot carrier transfer and molecule-to-molecule energy transfer processes. Hence, this ultrafast and long-range plasmon-induced energy transfer channel is especially useful for boosting the exciton/free carrier generation yield in semiconductor layers. Moreover, the enhancement in the exciton production yield does not diminish even when the photon energy is lowered toward the optical absorption edge of ZnPc. Therefore, the observed energy transfer process can extend the optical absorption to frequencies below the optical bandgap of the molecule.