Photovoltaic and Optoelectronic Devices Group, Physics Department, Universitat Jaume I, 12071 Castelló, Spain.
Chemphyschem. 2011 Apr 4;12(5):961-5. doi: 10.1002/cphc.201000958. Epub 2011 Mar 4.
Porphyrins are promising sensitizers for dye solar cells (DSCs) but narrow absorption bands at 400-450 and 500-650 nm limit their light-harvesting properties. Increasing elongation of the π-conjugation and loss of symmetry causes broadening and a red-shift of the absorption bands, which considerably improves the performance of the DSC. Herein we use an oligothienylenevinylene to bridge a Zn-porphyrin system and the anchoring group of the sensitizer. We separately study the performance of the two basic units: oligothienylenevinylene and Zn-porphyrin. The combined system provides a three-fold enhancement of the photocurrent with respect to parent dyes. This is caused by an additional strong absorption in the region 400-650 nm that leads to flat IPCE of 60%. Theoretical calculations support that the addition of the oligothienylenevinylene unit as a linking bridge creates a charge transfer band that transforms a Zn-porphyrin dye into a push-pull type system with highly efficient charge injection properties.
卟啉是有前途的染料敏化太阳能电池（DSC）敏化剂，但 400-450nm 和 500-650nm 之间的窄吸收带限制了它们的光捕获性能。增加π共轭的伸长和对称性的损失会导致吸收带的展宽和红移，这大大提高了 DSC 的性能。在此，我们使用一个寡聚噻吩乙烯基来桥接 Zn-卟啉体系和敏化剂的锚定基团。我们分别研究了两个基本单元：寡聚噻吩乙烯基和 Zn-卟啉的性能。与母体染料相比，组合系统的光电流提高了三倍。这是由于在 400-650nm 区域增加了强吸收，导致 IPCE 达到 60%的平坦值。理论计算支持了寡聚噻吩乙烯基单元作为连接桥的添加，它创建了一个电荷转移带，将 Zn-卟啉染料转化为具有高效电荷注入特性的推拉型体系。
