Novel D-A-pi-A organic dyes based on 3-dimensional triarylamine and benzothiadiazole derivatives for high-performance dye-sensitized solar cells
Novel D-A-pi-A organic dyes based on 3-dimensional triarylamine and benzothiadiazole derivatives for high-performance dye-sensitized solar cells
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基于三维三芳胺和苯并噻二唑衍生物的新型D-A-pi-A有机染料，用于高性能染料敏化太阳能电池
DOI：
10.1016/j.jpowsour.2016.06.099
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发表时间：
2016
影响因子：
9.2
通讯作者：
Tan Songting
中科院分区：
文献类型：
--
作者：
Huang Hongli;Chen Huajie;Long Jun;Wang Guo;Tan Songting
具有三维(3D)结构的有机染料有助于延缓染料聚集和电荷复合，提高染料敏化太阳能电池的功率转换效率。在这项贡献中，我们设计、合成了一种新型的含有吲哚基团的新型三芳胺衍生物(IDTTPA)，并将其应用于开发三维有机染料。合成了两种新型的D-A-π-A有机染料(CD_1和CD_2)，它们分别以IDTPA为电子供体，2，1，3-苯并噻二唑衍生物为辅助受体，甲酸为锚基。研究了含氟取代基对其光物理、电化学和光伏性能的影响。结果表明，含氟染料CD2具有较高的摩尔消光系数、较强的捕光能力和较好的光伏性能。性能研究表明，基于CD2的直接序列扩频通信系统的PCE值为7.91%，高于基于CD1的直接序列扩频通信系统的PCE值(6.29%)，甚至高于基于N719的参考直接序列通信系统的PCE值(7.49%)。本工作表明，这种3D单元(IDTTPA)是开发高效无金属有机染料的一个强有力的电子给体单元。
Organic dyes with a 3-dimensional (3D) structure is helpful for retarding dyes aggregation and charge recombination as well as improving the power conversion efficiency (PCE) of dye-sensitized solar cells (DSSCs). In this contribution, a novel 3D triarylamine derivative (IDTTPA) featuring an indenothiophenene unit has been designed, synthesized, and applied to develop a 3D organic dyes. Two novel D–A–π–A organic dyes (CD1 and CD2) based on IDTTPA as the electron donors, 2,1,3-benzothiadiazole derivatives as the auxiliary acceptors, and formic acid as the anchoring groups have been successfully synthesized and applied in DSSCs. The effects of the fluoro substitute groups on the photophysical, electrochemical, and photovoltaic properties are investigated. The results indicate that the fluoro-containing dye CD2 exhibits higher molar extinction coefficient, stronger light-capturing ability, and better photovoltaic performance than those of CD1 dye without fluoro substitute. Investigation of the DSSCs performance shows that CD2-based DSSCs exhibit a high PCE value of 7.91%, higher than that of CD1-based DSSCs (6.29%), even higher than that of the reference DSSCs based on N719 (7.49%). This works has demonstrated that this kind of 3D unit (IDTTPA) is a strong and promising electron donor unit to develop high efficiency metal-free organic dyes.