High open-circuit voltage solid-state dye-sensitized solar cells with organic dye.
Solid-state dye-sensitized solar cells were fabricated using an organic dye, 2-cyanoacrylic acid-4-(bis-dimethylfluoreneaniline)dithiophene (JK2), which exhibits more than 1 V open-circuit potential (V(oc)). To scrutinize the origin of high voltage in these cells, transient V(oc) decay measurements and density functional theroy calculations of the interacting dye/semiconductor surface were performed. A negative conduction band shift was observed due to the favorable dipolar field exerted by the JK2 sensitizer to the TiO(2) surface, at variance with heteroleptic Ru(II)-dyes for which an opposite dipole effect was found, providing an increased V(oc).
Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, CH - 1015 Lausanne, Switzerland.
Peter
P
Chen
Jun Ho
JH
Yum
Filippo
F
De Angelis
Edoardo
E
Mosconi
Simona
S
Fantacci
Soo-Jin
SJ
Moon
Robin Humphry
RH
Baker
Jaejung
J
Ko
Md K
MK
Nazeeruddin
Michael
M
Grätzel