Traditionally, metal free DSSCs are fabricated from sensitizers designed using a donor–pi–acceptor (D–π–A) architecture. More recently, non-conventional dyes without strong donor units have emerged and have provided competitive power conversion efficiencies (PCEs) with respect to their (D–π–A)-based counterparts. Here, we report the synthesis and DSSC fabrication of oligothiophene molecules featuring two anchoring groups that do not possess strong donor moieties and are able to adopt V- and U-shape conformations. PCEs of 3.70% were obtained with the smaller 5-thiophene dyes (5T2A, 5T2A-E) possessing higher PCEs than their larger 8-thiophene counterparts containing diacetylene units (8T4A, 8T4A-E). Comparison to the DSSC properties of the analogous linear dye 5T, indicates that the architecture and structure of this series of dyes are likely responsible for their lower performance.

中文翻译：

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具有双锚结构的无给体寡聚噻吩基染料，用于染料敏化太阳能电池

传统上，无金属的DSSC是由使用施主-π-受体（D-π-A）结构设计的敏化剂制成的。最近，已经出现了没有强大供体单元的非常规染料，并且相对于其基于（D–π–A）的同类产品，它们提供了具有竞争力的功率转换效率（PCE）。在这里，我们报道了具有两个锚定基团的寡聚噻吩分子的合成和DSSC制备，该两个锚定基团不具有强大的供体部分，并且能够采用V型和U型构象。与较小的5-噻吩染料（获得的3.70％的PCE 5T2A，5T2A​​-E ）具有比其更大的8 -噻吩含丁二炔单元同行更高的PCE（8T4A，8T4A-E）。与类似线性染料5T的DSSC特性进行比较，表明该系列染料的结构和结构可能是其较低性能的原因。