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).
Chen
Peter
P
Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Swiss Federal Institute of Technology, CH - 1015 Lausanne, Switzerland.
Yum
Jun Ho
JH
De Angelis
Filippo
F
Mosconi
Edoardo
E
Fantacci
Simona
S
Moon
Soo-Jin
SJ
Baker
Robin Humphry
RH
Ko
Jaejung
J
Nazeeruddin
Md K
MK
Grätzel
Michael
M