The development of polymer morphology and crystallinity of printed bulk heterojunction (BHJ) films doped with the different solvent additives 1,8‐diiodooctane (DIO) or diphenyl ether (DPE) is investigated with in situ grazing‐incidence small/wide‐angle X‐ray scattering. The solvent additives, having different boiling points, lead to a different film drying behavior and morphology growth states in the BHJ films of the benzothiadiazole‐based polymer (PPDT2FBT) and [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC₇₁BM). The phase demixing in the printed films is changing over time along with solvent evaporation. Polymer domains start aggregating to form larger domains in the liquid–liquid phase, while phase separation mainly occurs in the liquid–solid phase. The present work provides a profound insight into the morphology development of printed BHJ films doped with different solvent additives, which is particularly important for the large‐scale fabrication of organic photovoltaics.

中文翻译：

---

溶剂添加剂对有机太阳能电池本体异质结薄膜印刷过程中形貌发展的影响

使用原位掠入射小/广角X-射线研究了掺杂有不同溶剂添加剂1,8-二碘辛烷（DIO）或二苯醚（DPE）的印刷体异质结（BHJ）膜的聚合物形态和结晶度的发展。射线散射。具有不同沸点的溶剂添加剂导致苯并噻二唑基聚合物（PPDT2FBT）和[6,6]-苯基-C71-丁酸甲酯（PC）的BHJ膜具有不同的膜干燥行为和形态生长状态₇₁BM）。随着溶剂的蒸发，印刷膜中的相分离随着时间而改变。聚合物域在液相-液相中开始聚集形成更大的域，而相分离主要发生在液相-固相​​中。本工作为掺有不同溶剂添加剂的印刷BHJ膜的形貌发展提供了深刻的见识，这对于有机光伏的大规模生产特别重要。