Designed Polymer Donors to Match an Amorphous Polymer
Acceptor in All-Polymer Solar Cells
Posted on 2020-06-19 - 01:29
All-polymer solar
cells (all-PSCs) based on amorphous polymer acceptors
show different phase separation behaviors from those with conventional
semicrystalline polymer acceptors. In this work, to match an amorphous
polymer acceptor, we have designed three polymer donors with the same
conjugated backbone poly(benzo[1,2-b:4,5b′]dithiophene (BDT)-co-4,7-dithiophene-5,6-didecyloxylbenzo[2,1,3]thiadiazole)
but with zero, two, or four fluorine substitutes on the side chains.
The increasing number of fluorine substituents leads to downshifted
LUMO/HOMO energy levels and more serious aggregation behavior of the
polymer donors. The polymer bearing four fluorine substitutes (PD-4F)
matches well with the amorphous polymer acceptor. Benefiting from
the optimal phase separation morphology, improved charge transport,
and suppressed charge recombination, the PD-4F-based all-PSC device
shows the highest device performance with a power conversion efficiency
of 6.45%. These results indicate an effective approach of side chain
fluorination to design polymer donors to match amorphous polymer acceptors
for efficient all-PSCs.
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Wang, Ning; Zhang, Sheng; Zhao, Ruyan; Feng, Jirui; Ding, Zicheng; Ma, Wei; et al. (2020). Designed Polymer Donors to Match an Amorphous Polymer
Acceptor in All-Polymer Solar Cells. ACS Publications. Collection. https://doi.org/10.1021/acsaelm.0c00451
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AUTHORS (8)
NW
Ning Wang
SZ
Sheng Zhang
RZ
Ruyan Zhao
JF
Jirui Feng
ZD
Zicheng Ding
WM
Wei Ma
JH
Junli Hu
JL
Jun Liu
KEYWORDS
polymer acceptordesign polymer donorsAll-Polymer Solar Cells All-polymerfluorine substitutesphase separation morphologyside chain fluorinationAmorphous Polymer Acceptorpower conversion efficiencyLUMOsemicrystalline polymer acceptorspolymer donorsBDTPD -4F all-PSC devicepolymer acceptors showphase separation behaviors