A panchromatic anthracene-fused porphyrin sensitizer for dye-sensitized solar cells
A panchromatic anthracene-fused porphyrin sensitizer for dye-sensitized solar cells
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DOI：
10.1039/c2ra20952g
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
Ball, James M.;Davis, Nicola K. S.;Snaith, Henry J.
开发吸收宽范围太阳光谱的光的不含铼的敏化剂对于提高染料敏化太阳能电池的功率转换效率是重要的。在这里，我们研究了三种化学定制的卟啉染料。我们发现，通过将卟啉核与蒽单元融合，我们可以延长共轭长度并降低光学带隙，将吸收光谱移至近红外（NIR）。所有三种染料都在染料敏化太阳能电池中进行了测试，使用二氧化钛和二氧化锡作为电子传输材料。掺入蒽稠合卟啉染料的太阳能电池在高达约1100 nm的波长下表现出光电流收集，这是所报道的基于卟啉的系统的最长波长。尽管扩展了光子吸收带宽，但发现器件效率较低，这是基于具有NIR吸收的卟啉染料的电池的共同特性。我们表明，在目前的情况下，效率降低了低效的电子注入到氧化物中，而不是染料再生，并强调了一些重要的设计考虑全色敏化剂。
The development of ruthenium-free sensitizers which absorb light over a broad range of the solar spectrum is important for improving the power conversion efficiency of dye-sensitized solar cells. Here we study three chemically tailored porphyrin-based dyes. We show that by fusing the porphyrin core to an anthracene unit, we can extend the conjugation length and lower the optical gap, shifting the absorption spectrum into the near-infrared (NIR). All three dyes were tested in dye-sensitized solar cells, using both titanium dioxide and tin dioxide as the electron-transport material. Solar cells incorporating the anthracene-fused porphyrin dye exhibit photocurrent collection at wavelengths up to about 1100 nm, which is the longest reported for a porphyrin-based system. Despite extending the photon absorption bandwidth, device efficiency is found to be low, which is a common property of cells based on porphyrin dyes with NIR absorption. We show that in the present case the efficiency is reduced by inefficient electron injection into the oxide, as opposed to dye regeneration, and highlight some important design considerations for panchromatic sensitizers.