Comparative Study of Thermal Stability, Morphology,
and Performance of All-Polymer, Fullerene–Polymer, and Ternary
Blend Solar Cells Based on the Same Polymer Donor
Posted on 2017-08-18 - 19:04
We
compared the thermal and morphological stability of all-polymer
solar cells (all-PSCs) and fullerene-based PSCs (fullerene-PSCs) having
the same polymer donor (PBDTTTPD), which provided comparable peak
power conversion efficiencies (PCEs) of >6%. We observed a remarkable
contrast in thermal stability dependent upon the acceptor composition
in the active layer, with the performance of the fullerene-PSCs completely
deteriorating after annealing for 5 h at 150 °C, whereas that
of the all-PSCs remained stable even after annealing for 50 h at 150
°C. Pronounced phase separation was observed in the active layer
of the fullerene-PSCs at two different length scales. In stark contrast,
almost no morphological changes in the all-PSCs were observed, likely
due to the low diffusion kinetics of the polymer acceptors. To develop
a comprehensive understanding of the role of polymer acceptor on the
thermal stability of devices, the morphology of ternary blend active
layers composed of PBDTTTPD:polymer acceptor:fullerene acceptor with
different fullerene contents was examined while annealing at 150 °C.
The ternary blends showed two extreme trends of all-PSC- and fullerene-PSC-like
behavior in thermal stability depending on the PCBM content. When
included in the active layer as <30 wt % of the acceptor mixture,
fullerene was well-dispersed in the amorphous portion of the donor/acceptor
polymer blend under thermal stress and led to thermally stable devices
with a higher PCE (7.12%) than both all-PSCs without fullerene (6.67%)
and polymer–fullerene active layers without a polymeric acceptor
(6.12%).
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Kim, Taesu; Choi, Joonhyeong; Kim, Hyeong Jun; Lee, Wonho; Kim, Bumjoon J. (2017). Comparative Study of Thermal Stability, Morphology,
and Performance of All-Polymer, Fullerene–Polymer, and Ternary
Blend Solar Cells Based on the Same Polymer Donor. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b00834
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AUTHORS (5)
TK
Taesu Kim
JC
Joonhyeong Choi
HK
Hyeong Jun Kim
WL
Wonho Lee
BK
Bumjoon J. Kim
KEYWORDS
stabilitypolymer acceptorThermal Stabilityfullerene-PSC-like behaviorSame Polymer Donoracceptor mixtureSolar CellsPCE50 hPCBM contentternary blendternary blendspolymer donordiffusion kineticsfullerene-based PSCs5 hpolymer acceptorsPronounced phase separationlength scalesPBDTTTPDComparative Studyall-PSCfullerene contentsacceptor compositionpeak power conversion efficienciesannealing