Yaghoubi Houman, Lafalce Evan, Jun Daniel, Jiang Xiaomei, Beatty J Thomas, Takshi Arash
†Bio/Organic Electronics Lab, Department of Electrical Engineering, University of South Florida, Tampa, Florida 33620, United States.
‡Soft Semiconducting Materials and Devices Lab, Department of Physics, University of South Florida, Tampa, Florida 33620, United States.
Biomacromolecules. 2015 Apr 13;16(4):1112-8. doi: 10.1021/bm501772x. Epub 2015 Mar 30.
Bacterial photosynthetic reaction centers (RCs) are promising materials for solar energy harvesting, due to their high ratio of photogenerated electrons to absorbed photons and long recombination time of generated charges. In this work, photoactive electrodes were prepared from a bacterial RC-light-harvesting 1 (LH1) core complex, where the RC is encircled by the LH1 antenna, to increase light capture. A simple immobilization method was used to prepare RC-LH1 photoactive layer. Herein, we demonstrate that the combination of pretreatment of the RC-LH1 protein complexes with quinone and the immobilization method results in biophotoelectrochemical cells with a large peak transient photocurrent density and photocurrent response of 7.1 and 3.5 μA cm(-2), respectively. The current study with monochromatic excitation showed maximum external quantum efficiency (EQE) and photocurrent density of 0.21% and 2 μA cm(-2), respectively, with illumination power of ∼6 mW cm(-2) at ∼875 nm, under ambient conditions. This work provides new directions to higher performance biophotoelectrochemical cells as well as possibly other applications of this broadly functional photoactive material.
细菌光合反应中心（RCs）因其光生电子与吸收光子的高比例以及所产生电荷的长复合时间，是用于太阳能收集的有前景的材料。在这项工作中，由细菌RC-光捕获1（LH1）核心复合物制备光活性电极，其中RC被LH1天线环绕，以增加光捕获。采用一种简单的固定方法制备RC-LH1光活性层。在此，我们证明了用醌对RC-LH1蛋白质复合物进行预处理与固定方法相结合，可得到具有大的峰值瞬态光电流密度和光电流响应的生物光电化学电池，其光电流密度分别为7.1和3.5 μA cm(-2)。当前的单色激发研究表明，在环境条件下，在约875 nm处光照功率约为6 mW cm(-2)时，最大外量子效率（EQE）和光电流密度分别为0.21%和2 μA cm(-2)。这项工作为高性能生物光电化学电池以及这种具有广泛功能的光活性材料的其他可能应用提供了新的方向。
