Aqueous Soluble Fullerene Acceptors for Efficient
Eco-Friendly Polymer Solar Cells Processed from Benign Ethanol/Water
Mixtures
Version 2 2018-08-15, 21:09
Version 1 2018-08-15, 21:04
Posted on 2018-08-15 - 21:09
We
present a new series of fullerene derivatives that exhibit solubility
in ethanol/water solvent mixtures and implement these materials to
fabricate polymer solar cells (PSCs) using environmentally benign
solvents. In order to simultaneously optimize the processability of
the fullerenes in ethanol/water solvent mixtures and device performance,
different fullerene mono-adducts were designed by introducing oligoethylene
glycol side chains with different lengths and number of branches.
As a result, we achieved power conversion efficiencies up to 1.4%
for PSCs processed from benign ethanol/water mixtures in air. Significantly,
the new alcohol/water-soluble fullerene derivatives displayed electron
mobilities up to 1.30 × 10–4 cm2 V–1 s–1, 150 times higher than
those of a previously reported alcohol-soluble fullerene bis-adduct,
owing to efficient packing of the fullerenes. Femtosecond transient
absorption spectroscopy revealed the acceptor side chain to markedly
impact geminate and/or nongeminate charge recombination in the PSCs.
In addition, side chain optimization of these fullerenes produced
well-intermixed morphologies with high domain purity when blended
with p-type polymer to provide hole and electron transport pathways.
Our results provide important guidelines for the design of electroactive
materials for safe and environmentally benign fabrication of PSCs
and other organic electronic devices.
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Kim, Youngkwon; Choi, Joonhyeong; Lee, Changyeon; Kim, Youngwoong; Kim, Changkyun; Nguyen, Thanh Luan; et al. (2018). Aqueous Soluble Fullerene Acceptors for Efficient
Eco-Friendly Polymer Solar Cells Processed from Benign Ethanol/Water
Mixtures. ACS Publications. Collection. https://doi.org/10.1021/acs.chemmater.8b02086
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AUTHORS (10)
YK
Youngkwon Kim
JC
Joonhyeong Choi
CL
Changyeon Lee
YK
Youngwoong Kim
CK
Changkyun Kim
TN
Thanh Luan Nguyen
BG
Bhoj Gautam
KG
Kenan Gundogdu
HW
Han Young Woo
BK
Bumjoon J. Kim
KEYWORDS
fullerene mono-adductsdevice performanceimpact geminatemixtureexhibit solubilityalcohol-soluble fullerene bis-adductabsorption spectroscopydomain purityelectroactive materialsethanolelectron mobilitiesoligoethylene glycol side chains150 timesfullerene derivativesp-type polymerside chain optimizationEfficient Eco-Friendly Polymer Solar Cells Processedelectron transport pathwaysPSCpower conversion efficienciesAqueous Soluble Fullerene Acceptorsacceptor side chainwell-intermixed morphologies