In:
Angewandte Chemie International Edition, Wiley, Vol. 59, No. 24 ( 2020-06-08), p. 9324-9329
Kurzfassung:
Dye‐sensitized solar cells (DSSCs) based on Cu II/I bipyridyl or phenanthroline complexes as redox shuttles have achieved very high open‐circuit voltages ( V OC , more than 1 V). However, their short‐circuit photocurrent density ( J SC ) has remained modest. Increasing the J SC is expected to extend the spectral response of sensitizers to the red or NIR region while maintaining efficient electron injection in the mesoscopic TiO 2 film and fast regeneration by the Cu I 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.
Materialart:
Online-Ressource
ISSN:
1433-7851
,
1521-3773
DOI:
10.1002/anie.202000892
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2020
ZDB Id:
2011836-3
ZDB Id:
123227-7