514
Y. Ooyama
Fig. 14.33 Chemical structures of perylene dye sensitizers for ZnO DSSCs
14.3.3 Perylene Dyes
Perylene dyes DYE16–19 (Dentani et al. 2007) and a perylene monoimide dye PCA
(Mikroyannidis et al. 2009) with a carboxylic acid anhydride unit as an anchoring
group have been developed as dye sensitizers for ZnO DSSCs (Fig. 14.33). The ZnO
DSSC using PCA yielded an η value of 1.34% with a J sc value of 4.22 mA cm
−2 , a
V oc value of 610 mV, and a ff value of 0.52 under AM 1.5 simulated sunlight (100
mW cm
−2 ).
14.3.4 Heptamethine-Cyanine Dyes
Heptamethine–cyanine dyes DYE20–26 (Matsui et al. 2005), KFH-2, and KFH-3
(Funabiki et al. 2011) have been designed and synthesized as NIR-absorbing dye
sensitizers for ZnO DSSCs (Fig. 14.34). The ZnO DSSC using KFH-3 showed an η
value of 1.23% with an IPCE value of 33% at 800 nm, a J sc value of 3.34 mA cm
−2 ,
a V oc value of 490 mV, and a ff value of 0.76 under AM 1.5 simulated sunlight (100
mW cm
−2 ).
Fig. 14.34 Chemical structures of heptamethine–cyanine dye sensitizers for ZnO DSSCs