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@article{faucris.204907438,
abstract = {In this work, we present a novel small molecule based on
dithienylthienothiadiazole units (named SM1) acting as an efficient
component in ternary blend organic solar cells to modify the hole
extraction at the interface. Our findings show that the SM1 suppresses
the surface recombination and enhances the open-circuit voltage (Voc). By introducing SM1 in a host system composed of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), we obtained Voc
values of up to 0.75 V and fill factors larger than 70% for the ternary
blends. As a consequence, the power conversion efficiency is improved
by about 30% compared to P3HT:PCBM binary devices. Interestingly,
external quantum efficiency and absorption spectra in the near-infrared
region do not show any contribution of SM1 in dried films. Instead, the
addition of the small molecule improves the Voc by
reducing the surface recombination losses. To shed light on the
recombination processes, we carried out Fourier-transform photocurrent
spectroscopy and impedance spectroscopy measurements. This work shows
that the ternary concept can also have functionalities other than
photosensitization and can even act as a morphology-directing agent or
an interface modifie},
author = {Galli, Diana and Gasparini, Nicola and Forster, Michael and Eckert, Anika and Widling, Christian and Killian, Manuela and Avgeropoulos, Apostolos and Gregoriou, Vasilis G. and Scherf, Ullrich and Chochos, Christos L. and Brabec, Christoph and Ameri, Tayebeh},
doi = {10.1021/acsami.8b09174},
faupublication = {yes},
journal = {ACS Applied Materials and Interfaces},
keywords = {open-circuit voltages; recombination losses; ternary organic solar cells; sensitizers; small molecules},
pages = {28803-28811},
peerreviewed = {unknown},
title = {{Suppressing} the {Surface} {Recombination} and {Tuning} the {Open}-{Circuit} {Voltage} of {Polymer}/{Fullerene} {Solar} {Cells} by {Implementing} an {Aggregative} {Ternary} {Compound}},
volume = {10},
year = {2018}
}