Efficiency enhancements in solid-state hybrid solar cells via reduced charge recombination and increased light capture.
We compare a series of molecular sensitizers in dye-sensitized solar cells containing the organic hole transporter 2,2',7,7'-tetrakis(N,N-di-p-methoxypheny-amine)-9,9'-spirobifluorene (spiro-MeOTAD). Charge recombination is reduced by the presence of "ion-coordinating" moieties on the dye, with the longest electron lifetime and highest solar cell efficiency achieved using a novel sensitizer with diblock alkoxy-alkane pendent groups. By further increasing the optical path length in the active layer, we achieve a power conversion efficiency of over 5% under simulated sun light.
Snaith
Henry J
HJ
Institut de Chimie Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland. h.snaith1@physics.ox.ac.uk
Moule
Adam J
AJ
Klein
Cédric
C
Meerholz
Klaus
K
Friend
Richard H
RH
Grätzel
Michael
M