School of Engineering System, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia.
Phys Chem Chem Phys. 2011 Oct 14;13(38):17359-66. doi: 10.1039/c1cp22482d. Epub 2011 Aug 31.
The performance and electron recombination kinetics of dye-sensitized solar cells based on TiO(2) films consisting of one-dimensional nanorod arrays (NR-DSSCs) which are sensitized with dyes N719, C218 and D205, respectively, have been studied. It has been found that the best efficiency is obtained with the dye C218 based NR-DSSCs, benefiting from a 40% higher short-circuit photocurrent density. However, the open circuit photovoltage of the N719 based cell is 40 mV higher than that of the organic dye C218 and D205 based devices. Investigation of the electron recombination kinetics of the NR-DSSCs has revealed that the effective electron lifetime, τ(n), of the different dye based NR-DSSCs shows the sequence of C218 > D205 > N719. The higher V(oc) with the N719 based NR-DSSC is originated from the more negative energy level of the conduction band of the TiO(2) film. In addition, in comparison to the DSSCs with the conventional nanocrystalline particles based TiO(2) films, the NR-DSSCs have shown over two orders of magnitude higher τ(n) when employing N719 as the sensitizer. Nevertheless, the τ(n) of the DSSCs with the C218 based nanorod arrays is only ten-fold higher than that of the nanoparticles based devices. The remarkable characteristic of the dye C218 in suppressing the electron recombination of DSSCs is discussed.
基于一维纳米棒阵列的染料敏化太阳能电池（NR-DSSCs）的性能和电子复合动力学研究，这些纳米棒阵列的 TiO2 薄膜分别敏化了染料 N719、C218 和 D205。结果发现，基于染料 C218 的 NR-DSSCs 具有最高的效率，这得益于短路光电流密度提高了 40%。然而，基于 N719 的电池的开路光电压比基于有机染料 C218 和 D205 的器件高 40mV。对 NR-DSSCs 电子复合动力学的研究表明，不同染料基 NR-DSSCs 的有效电子寿命τ(n) 顺序为 C218 > D205 > N719。基于 N719 的 NR-DSSC 具有更高的 V(oc)，这是由于 TiO2 薄膜导带的能级更负。此外，与基于传统纳米晶颗粒的 DSSCs 相比，当使用 N719 作为敏化剂时，NR-DSSCs 的 τ(n) 提高了两个数量级以上。然而，基于 C218 纳米棒阵列的 DSSC 的 τ(n) 仅比基于纳米颗粒的器件高十倍。讨论了染料 C218 抑制 DSSC 电子复合的显著特性。
