Blue-coloured highly efficient dye-sensitized solar cells by implementing the diketopyrrolopyrrole chromophore.
The paradigm shift in dye sensitized solar cells (DSCs) - towards donor- π bridge-acceptor (D-π-A) dyes - increases the performances of DSCs and challenges established design principles. Framed by this shifting landscape, a series of four diketopyrrolopyrrole (DPP)-based sensitizers utilizing the donor-chromophore-anchor (D-C-A) motif were investigated computationally, spectroscopically, and fabricated by systematic evaluation of finished photovoltaic cells. In all cases, the [Co(bpy)3](3+/2+) redox-shuttle afforded superior performance compared to I3(-)/I(-). Aesthetically, careful molecular engineering of the DPP chromophore yielded the first example of a high-performance blue DSC - a challenge unmet since the inception of this photovoltaic technology: DPP17 yields over 10% power conversion efficiency (PCE) with the [Co(bpy)3](3+/2+) electrolyte at full AM 1.5 G simulated sun light.
Insitute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland. junho.yum@epfl.ch
Jun-Ho
JH
Yum
Thomas W
TW
Holcombe
Yongjoo
Y
Kim
Kasparas
K
Rakstys
Thomas
T
Moehl
Joel
J
Teuscher
Jared H
JH
Delcamp
Mohammed K
MK
Nazeeruddin
Michael
M
Grätzel
D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D011211:Electric Power Supplies; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D011758:Pyrroles / Q000737:chemistry* / Q000528:radiation effects; D012993:Solar Energy
D004396:Coloring Agents; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole