Publication date: 8th January 2019
In the last few years a significant evolution in the field of organic photovoltaics (OPVs) is achieved thanks to the synthesis of new generation donor-acceptor polymers with reported power conversion efficiencies (PCE) above 10%. This study is focusing on one of those polymers known as PCE11 (poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3´´´-di(2-octyldodecyl) 2,2´;5´,2´´;5´´,2´´´-quaterthiophen-5,5´´´-diyl)]). PCE11 is a polymer that shows highly tunable optical properties under various processing conditions and has a reported PCE of 11.5%.[1] We employ temperature dependent Resonance Raman Spectroscopy (RRS) to develop a basic understanding on how temperature affect the polymer conformation and thus its optoelectronic properties. Moreover, by combining experimental data obtained by steady state RRS and Absorption it is possible to extract additional information regarding the excited-state structure and dynamics. In particular, the shape of the absorption spectra can be determined by the displacements between the ground and excited state potential energy surface minima in each mode, which are directly related to the intensities of RR bands. In the present study, we use a computational method called Resonance Raman Intensity Analysis (RRIA) that provides access to a quantitative picture of the excited state, such as the change in the molecular geometry, gaining thus insights that will aid in the interpretation of the photophysical behaviour of this donor-acceptor polymer.
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