Jiang Huiyun, Ren Yameng, Zhang Weiwei, Wu Yongzhen, Socie Etienne Christophe, Carlsen Brian Irving, Moser Jacques-E, Tian He, Zakeeruddin Shaik Mohammed, Zhu Wei-Hong, Grätzel Michael
Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Shanghai Key Laboratory of Functional Materials Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
Angew Chem Int Ed Engl. 2020 Jun 8;59(24):9324-9329. doi: 10.1002/anie.202000892. Epub 2020 Apr 2.
Dye-sensitized solar cells (DSSCs) based on Cu bipyridyl or phenanthroline complexes as redox shuttles have achieved very high open-circuit voltages (V , more than 1 V). However, their short-circuit photocurrent density (J ) has remained modest. Increasing the J is expected to extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection in the mesoscopic TiO film and fast regeneration by the Cu complex. Herein, we report two new D-A-π-A-featured sensitizers termed HY63 and HY64, which employ benzothiadiazole (BT) or phenanthrene-fused-quinoxaline (PFQ), respectively, as the auxiliary electron-withdrawing acceptor moiety. Despite their very similar energy levels and absorption onsets, HY64-based DSSCs outperform their HY63 counterparts, achieving a power conversion efficiency (PCE) of 12.5 %. PFQ is superior to BT in reducing charge recombination resulting in the near-quantitative collection of photogenerated charge carriers.
基于联吡啶铜或菲咯啉配合物作为氧化还原穿梭体的染料敏化太阳能电池（DSSC）已实现了非常高的开路电压（V，超过1 V）。然而，它们的短路光电流密度（J）仍然适中。预计增加J可将敏化剂的光谱响应扩展到红色或近红外区域，同时在介观TiO薄膜中保持有效的电子注入，并通过铜配合物实现快速再生。在此，我们报道了两种具有D-A-π-A结构的新型敏化剂，分别称为HY63和HY64，它们分别采用苯并噻二唑（BT）或菲并喹喔啉（PFQ）作为辅助吸电子受体部分。尽管它们的能级和吸收起始点非常相似，但基于HY64的DSSC性能优于基于HY63的DSSC，功率转换效率（PCE）达到12.5%。在减少电荷复合方面，PFQ优于BT，从而实现了光生电荷载流子的近定量收集。
