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New Journal of Chemistry
Page 11 of 13
NJC
DOI: 10.1039/C6NJ02469F
ARTICLE
9
H. J. Son, W. Wang, T. Xu, Y. Y. Liang, Y. Wu, G. Li, L. P. Yu, J.
Am. Chem. Soc., 2011, 133, 1885.
low interaction between PC71BM and the polymer. This may as well
be the reason for not getting proper film coating on the substrate.
Therefore, we could not obtain an I-V curve for the devices using
this polymer.
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Conclusions
2,1,3-Benzooxadiazole, thiophene and benzodithiophene
based random copolymers were synthesized via Stille
polycondensation reaction. Thiophene and thieno[3,2-
b]thiophene were used as the π-conjugated linkers. P1 and P2
exhibit a light blue color whereas P3 has a light purple color in
their neutral states. P1 has an optical band gap of 1.82 eV
whereas optical band gaps of P2 and P3 are 1.77 eV and 1.72
eV, respectively. Incorporation of conjugated linkers into
polymer backbone allowed to obtain lower band gap polymers
due to increase in the π-electron density. Without any post-
treatment, the blend of P2 and PC71BM ([6,6]-phenyl-C71-
butyric acid methyl ester), exhibited a value of PCE of 4.48 %
with a Jsc value of 8.88 mAcm-2, VOC of 0.79 V, FF of 64 %
under the illumination of AM 1.5 G, 100 mWcm-2. The addition
of DIO improved the device performance to 5.17 % through a
rise in current density. As stated in photovoltaic studies
section, photovoltaic characteristic evaluations for P1 and P3
could not be done. For further studies, P3 will be synthesized
with lower molecular weight, solar cell based on this polymer
will be constructed.
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