Conjugated polymers are a special type of material responsible for light absorption in polymer solar cells. The absorption of these materials plays an important role in photon harvesting and energy conversion. Ternary organic solar cells are a type of OPV that combines two‐electron donors with complementary absorption in a single layer. The present work deals with the synthesis and characterization of a high‐bandgap polymer prepared through the alternation of two high‐electron density aromatic units (thiophene‐benzodithiophene). This polymer presented high bandgap (2.1 eV) with potential for complementary absorption in a ternary device, as well as high V_oc when applied in a single junction inverted OPV device in heterojunction with PC₇₀BM (0.95 V), which agrees with the relatively large energy difference between its HOMO and the LUMO of PC₇₀BM determined through CV and UV‐vis. A dynamic GIWAXS study was performed and demonstrated that for this polymer, increasing annealing temperature to 80°C can increase its crystalline organization by up to 50%.

中文翻译：

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噻吩-苯并二噻吩宽带隙聚合物的合成及GIWAXS热退火的评估及其在三元聚合物太阳能电池中的应用潜力

共轭聚合物是负责聚合物太阳能电池中光吸收的一种特殊类型的材料。这些材料的吸收在光子收集和能量转换中起着重要作用。三元有机太阳能电池是一种将双电子给体与互补吸收结合在单层中的一类OPV。本工作涉及通过两个高电子密度芳族单元（噻吩-苯并二噻吩）的交替制备的高带隙聚合物的合成和表征。这种聚合物呈现出高带隙（2.1 eV），在三元器件中具有互补吸收的潜力，在与PC ₇₀异质结的单结倒置OPV器件中应用时具有高V _oc。BM（0.95 V），这与通过CV和UV-vis确定的HOMO和PC ₇₀ BM的LUMO之间的相对较大的能量差相吻合。进行了动态GIWAXS研究，结果表明，对于这种聚合物，将退火温度提高到80°C可以将其晶体组织提高多达50％。