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photoresponses (see Supporting Information) and conse-
quently high Jsc, (Table 1) which are comparable to that for
P3HT:PC61BM. Small decreases of the Jsc for CNT-containing
polymers can be attributed to different optimal polymer:ful-
lerene ratios and similar, but unoptimized active layer thick-
nesses (80–90 nm) that do not account for the different
fullerene loadings or polymer absorption coefficients. High
FF, above 0.55, were obtained for all polymer:PC61BM solar
cells. High Jsc and FF are attributed to balanced and trap free
charge transport through the bulk6,21,22 and favorable mor-
phology.23,24 Further morphological studies, performed using
transmission electron microscopy (TEM), confirmed the for-
mation of similar bicontinuous blends with nanometer scale
phase separation for all polymer:PC61BM blends (see Sup-
porting Information). As a result of high Jsc and FF, as well
as enhanced Voc, the efficiencies of P3HT-CNT:PC61BM solar
cells exceeded 3%, comparable to that for P3HT:PC61BM
while using the same thicknesses for the active layers.
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8 B. Burkhart, P. P. Khlyabich, B. C. Thompson, Macromole-
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9 B. Carsten, F. He, H. J. Son, T. Xu, L. Yu, Chem. Rev. 2011,
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10 B. Burkhart, P. P. Khlyabich, T. Cakir Canak, T. W. LaJoie, B.
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In summary, we developed a new synthetic route and syn-
thesized an easily attainable family of P3HT-CNT polymers
with deep-lying HOMO levels, where the amount of CNT was
varied from 5 to 20%. P3HT-CNT polymers preserved impor-
tant properties of rr-P3HT, such as strong absorption in the
visible, semicrystallinity and high hole mobility. In poly-
mer:PC61BM BHJ solar cells, high Voc in the range 0.72–0.81
V was achieved, which together with high Jsc and FF showed
promising efficiency.
13 A. Krasovskiy, V. Krasovskaya, P. Knochel, Angew. Chem.
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ACKNOWLEDGMENTS
19 U. Zhokhavets, T. Erb, G. Gobsch, M. Al-Ibrahim, O.
Ambacher, Chem. Phys. Lett. 2006, 418, 347–350.
This material is based upon work supported as part of the Cen-
ter for Energy Nanoscience, an Energy Frontier Research Cen-
ter funded by U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences under Award Number DE-
SC0001013.
20 R. Noriega, J. Rivnay, K. Vandewal, F. P. V. Koch, N.
Stingelin, P. Smith, M. F. Toney, A. Salleo, Nat. Mater. 2013,
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21 J. D. Kotlarski, D. J. D. Moet, P. W. M. Blom, J. Polym. Sci.
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