Influence of Phenylethynylene of Push–Pull Zinc Porphyrins on the Photovoltaic Performance
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- 作者：Hsien-Hsin Chou ; Kamani Sudhir K. Reddy ; Hui-Ping Wu ; Bo-Cheng Guo ; Hsuan-Wei Lee ; Eric Wei-Guang Diau ; Chao-Ping Hsu ; Chen-Yu Yeh
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：February 10, 2016
- 年：2016
- 卷：8
- 期：5
- 页码：3418-3427
- 全文大小：619K
- ISSN：1944-8252
文摘
A series of zinc porphyrin dyes YD22–YD28 were synthesized and used for dye-sensitized solar cells. Dyes YD26–YD28 consist of zinc porphyrin (ZnP) as core unit, arylamine (Am) as electron-donating group, and p-ethynylbenzoic acid (EBA) as an electron-withdrawing/-anchoring group. The dyes YD22–YD25 contain additional phenylethynylene group (PE) bridged between Am and ZnP units. The influence of the PE unit on molecular properties as well as photovoltaic performances were investigated via photophysical and electrochemical studies and density functional calculations. With the insertion of PE unit, the dyes YD22–YD25 possess better light-harvesting properties in terms of significantly red-shifted Q-band absorption. The conversion efficiencies for dyes YD22–YD25 are better than those of dyes YD26–YD28 owing to larger JSC output. Natural transition orbitals and Mulliken charge analysis were used to analyze the electron injection efficiency for porphyrin dyes upon time-dependent DFT calculations. The results indicated that insertion of additional PE unit is beneficial to higher JSC by means of improved light-harvesting property due to broadened and red-shifted absorption.