Artificial photosynthetic reaction centers coupled to light-harvesting antennas
Artificial photosynthetic reaction centers coupled to light-harvesting antennas
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DOI：
10.1103/physreve.84.061138
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发表时间：
2011-12-22
影响因子：
2.4
通讯作者：
Nori, Franco
中科院分区：
文献类型：
--
作者：
Ghosh, Pulak Kumar;Smirnov, Anatoly Yu.;Nori, Franco
我们分析了一个人工光合系统中能量和电子转移的理论模型。光系统由分子三联体（即，具有供体、光敏单元和受体）偶联到四个辅助光捕获天线色素。从天线到人工反应中心（分子三元组）的共振能量转移在这里由Forster机制描述。我们考虑两种不同的安排的辅助捕光色素周围的反应中心。第一种布置允许从所有周围的颜料直接激发转移到反应中心。第二种构型通过级联机制沿着一条捕光发色团链传输能量，其中只有一个发色团连接到反应中心。我们表明，使用级联能量转移的人工光合系统吸收光子在更宽的波长范围内，并将其能量转化为电能，具有更高的效率比系统的基础上直接耦合之间的所有天线发色团和反应中心。
We analyze a theoretical model for energy and electron transfer in an artificial photosynthetic system. The photosystem consists of a molecular triad (i.e., with a donor, a photosensitive unit, and an acceptor) coupled to four accessory light-harvesting-antenna pigments. The resonant energy transfer from the antennas to the artificial reaction center (the molecular triad) is described here by the Forster mechanism. We consider two different kinds of arrangements of the accessory light-harvesting pigments around the reaction center. The first arrangement allows direct excitation transfer to the reaction center from all the surrounding pigments. The second configuration transmits energy via a cascade mechanism along a chain of light-harvesting chromophores, where only one chromophore is connected to the reaction center. We show that the artificial photosynthetic system using the cascade energy transfer absorbs photons in a broader wavelength range and converts their energy into electricity with a higher efficiency than the system based on direct couplings between all the antenna chromophores and the reaction center.