Surface Energy Relay Between Cosensitized Molecules in Solid-State Dye-Sensitized Solar Cells
Surface Energy Relay Between Cosensitized Molecules in Solid-State Dye-Sensitized Solar Cells
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DOI：
10.1021/jp207075z
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发表时间：
2011-11-24
影响因子：
3.7
通讯作者：
Snaith, Henry. J.
中科院分区：
文献类型：
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作者：
Brown, Michael D.;Parkinson, Patrick;Snaith, Henry. J.
我们采用可见光吸收有机敏化剂和近红外吸收锌酞菁配合物的共敏化，以显着提高基于spiroOMeCl4的固态DSC的光学带宽。共敏化电池表现出极大的增强性能，与全太阳艾姆斯功率转换效率为4.7%，相比，最好的monosensitized设备的3.9%。出乎意料的是，进一步加宽光谱响应，添加近IR敏化剂大大增强了可见光区的光谱响应。通过电子和光谱研究，我们证明了共振能量转移发生从可见光到近红外敏化剂。这种不可预见的电荷产生途径与来自可见光敏化剂的直接电子转移一起工作，提高了整体电荷产生效率，并解释了与共敏化系统的全色增强。这种以前未观察到的电荷产生机制放宽了可见光吸收敏化剂的设计标准，为有效的电荷产生提供了第二个，也可能是主要的通道。
We employ cosensitization of a visible absorbing organic sensitizer and a near IR absorbing Zn-phthalocyanine complex to significantly enhance the optical bandwidth in spiroOMeTAD based solid-state DSCs. The cosensitized cells exhibit greatly enhanced performance, with full sun AMES power conversion efficiencies of 4.7%, as compared to 3.9% for the best monosensitized device. Unexpectedly, further to broadening the spectral response, the addition of the near IR sensitizer greatly enhances the spectral response in the visible region. Through both electronic and spectroscopic investigations, we demonstrate that resonant energy transfer occurs from the visible to the near IR sensitizer. This unforeseen charge generation route works in conjunction with direct electron transfer from the visible sensitizer, improving the overall charge generation efficiency and explaining the panchromatic enhancements with the cosensitized system. This previously unobserved mechanism for charge generation relaxes the design criteria for visible absorbing sensitizers, providing a second, and possibly primary, channel for efficient charge generation.