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- Title
Phenanthrene‐Fused‐Quinoxaline as a Key Building Block for Highly Efficient and Stable Sensitizers in Copper‐Electrolyte‐Based Dye‐Sensitized Solar Cells.
- Authors
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
- Abstract
Dye‐sensitized solar cells (DSSCs) based on CuII/I bipyridyl or phenanthroline complexes as redox shuttles have achieved very high open‐circuit voltages (VOC, more than 1 V). However, their short‐circuit photocurrent density (JSC) has remained modest. Increasing the JSC is expected to extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection in the mesoscopic TiO2 film and fast regeneration by the CuI 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.
- Subjects
DYE-sensitized solar cells; PHOTOSENSITIZERS; SPECTRAL sensitivity; OPEN-circuit voltage; CHARGE carriers; HIGH voltages
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 24, p9410
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202000892