Toward High-Temperature Stability of PTB7-Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent Additive
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Other documents of the author: Dkhil, Sadok Ben; Pfannmöller, Martin; Saba, Maria Ilenia; Gaceur, Meriem; Heidari, Hamed; Videlot-Ackermann, Christine; Margeat, Olivier; Guerrero, Antonio; Bisquert, Juan; Garcia-Belmonte, Germà; Mattoni, Alessandro; Bals, Sara; Ackermann, Jörg
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Title
Toward High-Temperature Stability of PTB7-Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent AdditiveAuthor (s)
Date
2017-02Publisher
WileyBibliographic citation
DKHIL, Sadok Ben, et al. Toward High‐Temperature Stability of PTB7‐Based Bulk Heterojunction Solar Cells: Impact of Fullerene Size and Solvent Additive. Advanced Energy Materials, 2016.Type
info:eu-repo/semantics/articlePublisher version
http://onlinelibrary.wiley.com/doi/10.1002/aenm.201601486/fullVersion
info:eu-repo/semantics/acceptedVersionSubject
Abstract
The use of fullerene as acceptor limits the thermal stability of organic solar
cells at high temperatures as their diffusion inside the donor leads to phase
separation via Ostwald ripening. Here it is reported that ... [+]
The use of fullerene as acceptor limits the thermal stability of organic solar
cells at high temperatures as their diffusion inside the donor leads to phase
separation via Ostwald ripening. Here it is reported that fullerene diffusion is
fully suppressed at temperatures up to 140 °C in bulk heterojunctions based
on the benzodithiophene-based polymer (the poly[[4,8-bis[(2-ethylhexyl)oxy]-
benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]-
thieno[3,4-b]thiophenediyl]], (PTB7) in combination with the fullerene derivative
[6,6]-phenyl-C71-butyric acid methyl ester (PC70BM). The blend stability is
found independently of the presence of diiodooctane (DIO) used to optimize
nanostructuration and in contrast to PTB7 blends using the smaller fullerene
derivative PC70BM. The unprecedented thermal stability of PTB7:PC70BM
layers is addressed to local minima in the mixing enthalpy of the blend
forming stable phases that inhibit fullerene diffusion. Importantly, although
the nanoscale morphology of DIO processed blends is thermally stable, corresponding
devices show strong performance losses under thermal stress.
Only by the use of a high temperature annealing step removing residual DIO
from the device, remarkably stable high efficiency solar cells with performance
losses less than 10% after a continuous annealing at 140 °C over
3 days are obtained. These results pave the way toward high temperature
stable polymer solar cells using fullerene acceptors. [-]
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Advanced Energy Materials Volume 7, Issue 4, February 2017Rights
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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