1 Supporting Information to The PCPDTBT family: correlations between chemical structure, polymorphism, and device performance G.L. Schulz 1 , F.S.U. Fischer 1 , D. Trefz 1 , A. Melnyk 2,3 , A. Hamidi-Sakr 4 , M. Brinkmann 4 , D. Andrienko 2 , S. Ludwigs 1* UV-vis Absorption Figure S1. Temperature-dependent absorption spectra of C-PCPDTBT in THF (3 mg/mL), measured in the temperature range between 55°C (red) and −15°C (blue) with 10°C temperature steps shown in grey. Spectrum measured at RT shown as dashed line.