Jinadasa R G Waruna, Li Bihong, Schmitz Benjamin, Kumar Siddhartha, Hu Yi, Kerr Lei, Wang Hong
Department of Chemistry and Biochemistry, Miami University, Oxford, OH, 45056, USA.
Department of Chemical, Paper and Biomedical Engineering, Miami University, Oxford, OH, 45056, USA.
ChemSusChem. 2016 Aug 23;9(16):2239-49. doi: 10.1002/cssc.201600619. Epub 2016 Jul 29.
A series of monobenzoporphyrins (WH1-WH4) bearing different conjugated spacer groups were designed and synthesized as sensitizers for dye-sensitized solar cells. Although a phenyl spacer only has a minimal impact on the absorption bands of the monobenzoporphyrin, an ethynylphenyl (WH3) or a vinyl (WH4) spacer redshifts and broadens the absorption bands of the dyes to result in much enhanced light-harvesting ability. Dye-sensitized solar cells based on these monobenzoporphyrin dyes displayed remarkable differences in power conversion efficiencies (PCEs). The monobenzoporphyrin bearing no spacer (WH1) resulted in a PCE of only 0.5 %; in contrast, the monobenzoporphyrin bearing vinyl spacers (WH4) achieved a PCE of 5.2 %. The high efficiency of the WH4 cell is attributed to the higher light-harvesting ability, the lesser extent of aggregation on the TiO2 surface, and the more favorable electron-density distributions of the HOMO and LUMO for electron injection and collection. This work demonstrates the exceptional tunability of benzoporphyrins as sensitizers for dye-sensitized solar cells.
设计并合成了一系列带有不同共轭间隔基团的单苯并卟啉（WH1-WH4）作为染料敏化太阳能电池的敏化剂。尽管苯基间隔基对单苯并卟啉的吸收带影响极小，但乙炔基苯基（WH3）或乙烯基（WH4）间隔基会使染料的吸收带发生红移并展宽，从而显著提高光捕获能力。基于这些单苯并卟啉染料的染料敏化太阳能电池在功率转换效率（PCE）方面表现出显著差异。不含间隔基的单苯并卟啉（WH1）的PCE仅为0.5%；相比之下，带有乙烯基间隔基的单苯并卟啉（WH4）的PCE达到了5.2%。WH4电池的高效率归因于更高的光捕获能力、在TiO2表面较小的聚集程度以及HOMO和LUMO更有利于电子注入和收集的电子密度分布。这项工作证明了苯并卟啉作为染料敏化太阳能电池敏化剂具有出色的可调性。
