Polarisation spectroscopy of thin films of F8BT poly(9,9-dioctylfluorene-alt-benzothiadiazole) polymer
Zedomi T. E.1, Kotova L. V. 1,2, Smirnov A.M. 2, Kochereshko V. P. 1
1Ioffe Institute, St. Petersburg, Russia
2Department of Physics, Lomonosov Moscow State University, Moscow, Russia
Email: t.zedomi@mail.ioffe.ru

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In this work, the transmission spectra feature of F8BT (poly(9,9-dioctylfluorene-alt-benzothiadiazole)) polymer films were studied, for which significant optical anisotropy was established. The effect of temperature heating and additional irradiation on the anisotropy of optical properties was studied. It was found that UV irradiation leads to a significant increase in the refractive index difference along and across some axis lying in the sample plane. The temperature effect partially attenuates this difference. The observed phenomenon can be explained by the destruction of chemical bonds in polymer chains of poly(9.9-dioctylfluorene-alt-benzothiadiazole). Keywords: poly(9,9-dioctylfluorene-alt-benzothiadiazole), optical anisotropy, polarization spectroscopy, circular polarization.
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