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Real‐Time Study on Structure Formation and the Intercalation Process of Polymer: Fullerene Bulk Heterojunction Thin Films
Solar RRL ( IF 6.0 ) Pub Date : 2020-01-24 , DOI: 10.1002/solr.201900508
Thaer Kassar 1 , Marvin Berlinghof 1 , Nusret Sena Güldal 2 , Tilo Schmutzler 1 , Federico Zontone 3 , Marco Brandl 1 , Ezzeldin Metwalli 1 , Johannes Will 1 , Ning Li 2 , Tayebeh Ameri 4 , Christoph J. Brabec 2 , Tobias Unruh 1
Affiliation  

Fullerene intercalation between the side chains of conjugated polymers has a detrimental impact on both charge separation and charge transport processes in bulk heterojunction (BHJ) organic photovoltaic cells (OPVs). In situ grazing incidence X‐ray scattering experiments allow to characterize the structure formation, drying kinetics, and intercalation in blends of phenyl‐c61‐butyric acid methyl ester (PC60BM) and poly(2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene) named (pBTTT‐C14) from their 1,2‐orthodichlorobenzene (oDCB) solutions with different volume fractions of dodecanoic acid methyl ester (Me12) as a solvent additive. The structure formation process during evaporation of the solvent:additive mixture can be described by five periods, which are correlated to a multistep contraction of the lamellar stacking of the bimolecular crystals. The onset of crystallization is delayed by increasing the additive volume fraction in the coating solution leading to a promoted crystallinity. A conclusive picture of fullerene intercalation and additive‐tuned structural evolution during the drying of thin films of the polymer:fullerene BHJ blends will be presented.

中文翻译:

聚合物的结构形成和嵌入过程的实时研究:富勒烯本体异质结薄膜

共轭聚合物侧链之间的富勒烯插层对本体异质结(BHJ)有机光伏电池(OPV)中的电荷分离和电荷传输过程均具有不利影响。原位放牧入射X射线散射实验可以表征苯基-c61-丁酸甲酯混合物中的结构形成,干燥动力学和嵌入(PC 60BM)和聚(2,5-双(3-十四烷基噻吩-2-基)噻吩并[3,2-b]噻吩)从其1,2-邻二氯苯(oDCB)溶液中以不同的体积分数命名为(pBTTT-C14)十二烷甲酸甲酯(Me12)作为溶剂添加剂。溶剂:添加剂混合物的蒸发过程中的结构形成过程可以用五个周期来描述,这与双分子晶体的层状堆叠的多步收缩有关。通过增加涂料溶液中添加剂的体积分数来延迟结晶的开始,从而提高结晶度。将提供聚合物,富勒烯BHJ共混物薄膜干燥过程中富勒烯插层和添加剂调整的结构演变的结论性图片。
更新日期:2020-01-24
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