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| 題名: | Metal-Free Tetrathienoacene Sensitizers for High-Performance Dye-Sensitized Solar Cells |
| 作者: | 張勝雄;Zhou, Nanjia;Prabakaran, Kumaresan;Lee, Byunghong;Chang, Sheng Hsiung;Harutyunyan, Boris;Guo, Peijun;Butler, Melanie R;Timalsina, Amod;Bedzyk, Michael J;Ratner, Mark A;Vegiraju, Sureshraju;Yau, Shuehlin;Wu, Chun-Guey;Chang, Robert P. H;Facchetti, Antonio;Chen, Ming-Chou;Marks, Tobin J |
| 貢獻者: | 理學院光電科學與工程學系 |
| 關鍵詞: | absorption;catalysis (homogeneous), catalysis (heterogeneous), solar (photovoltaic), solar (fuels), photosynthesis (natural and artificial), bio-inspired, hydrogen and fuel cells, electrodes - solar, defects, charge transport, spin dynamics, membrane, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly);dyes;photovoltaic cells;thiophene;titanium dioxide |
| 日期: | 2015-04-08 |
| 上傳時間: | 2026-04-23 11:36:47 (UTC+8) |
| 出版者: | American Chemical Society;United States: American Chemical Society |
| 摘要: | 摘要： A new series of metal-free organic chromophores (TPA-TTAR-A (1), TPA-T-TTAR-A (2), TPA-TTAR-T-A (3), and TPA-T-TTAR-T-A (4)) are synthesized for application in dye-sensitized solar cells (DSSC) based on a donor-π-bridge-acceptor (D−π–A) design. Here a simple triphenylamine (TPA) moiety serves as the electron donor, a cyanoacrylic acid as the electron acceptor and anchoring group, and a novel tetrathienoacene (TTA) as the π-bridge unit. Because of the extensively conjugated TTA π-bridge, these dyes exhibit high extinction coefficients (4.5–5.2 × 104 M–1 cm–1). By strategically inserting a thiophene spacer on the donor or acceptor side of the molecules, the electronic structures of these TTA-based dyes can be readily tuned. Furthermore, addition of a thiophene spacer has a significant influence on the dye orientation and self-assembly modality on TiO2 surfaces. The insertion of a thiophene between the π-bridge and the cyanoacrylic acid anchoring group in TPA-TTAR-T-A (dye 3) promotes more vertical dye orientation and denser packing on TiO2 (molecular footprint = 79 Å2), thus enabling optimal dye loading. Using dye 3, a DSSC power conversion efficiency (PCE) of 10.1% with V oc = 0.833 V, J sc = 16.5 mA/cm2, and FF = 70.0% is achieved, among the highest reported to date for metal-free organic DSSC sensitizers using an I–/I3 – redox shuttle. Photophysical measurements on dye-grafted TiO2 films reveal that the additional thiophene unit in dye 3 enhances the electron injection efficiency, in agreement with the high quantum efficiency.
其他題名： J. Am. Chem. Soc
出版者： United States: American Chemical Society
出版日期： 2015-04-08
出處： Journal of the American Chemical Society, 2015-04, Vol.137 (13), p.4414-4423
資源來源： American Chemical Society Journals
版權： Copyright © American Chemical Society
識別號： ISSN: 0002-7863
識別號： ISSN: 1520-5126
識別號： EISSN: 1520-5126
識別號： DOI: 10.1021/ja513254z
識別號： PMID: 25768124 |
| 顯示於類別: | [光電科學與工程學系] 期刊論文
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