ARTICLE
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T. W.; Douglas, J. D.; Woo, C. H.; Beaujuge, P. M.; Fre´chet. J.
M. J. J Am Chem Soc 2010, 132, 7595–7597; (d) Padhy, H.;
Huang, J. H.; Sahu, D.; Patra, D.; Kekuda, D.; Chu, C. W.; Lin, H.
C. J Polym Sci Part A: Polym Chem 2010, 48, 4823–4834; (e)
Jung, I. H.; Kim, H.; Park, M. J.; Kim, B.; Park, J. H.; Jeong, E.;
Woo, H. Y.; Yoo, S.; Shim, H. K. J Polym Sci Part A: Polym
Chem 2010, 48, 1423–1432; (f) Chen, G. Y.; Chiang, C. M.;
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eV). The HOMO levels of PFV-HBT, PPV-HBT, and PTV-HBT
are ꢃ5.27, ꢃ5.07, and ꢃ4.96 eV, respectively, which means
that the order of the donor strength is dialkylthiophene >
dialkyloxyphenylene
> dialkylfluorene. The photovoltaic
devices based on the polymers show the PCE in the range of
0.33–1.05%, which indicate that it is an effective way to
improve the PCE of photovoltaic devices by adjusting the
electron-donating abilities for the type of D-A copolymers.
This work was supported by the State Key Development Pro-
gram for Basic Research of China (Grant No. 2009CB623605),
the National Natural Science Foundation of China (Grant No.
20874035), the 111 Project (Grant No. B06009), and the Pro-
ject of Jilin Province (20080305).
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