Roles of Interfacial Tension in Regulating Internal Organization of Low Bandgap Polymer Bulk Heterojunction Solar Cells by Polymer Additives,Advanced Materials Interfaces

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Roles of Interfacial Tension in Regulating Internal Organization of Low Bandgap Polymer Bulk Heterojunction Solar Cells by Polymer Additives
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-06-21 , DOI: 10.1002/admi.201800435
Zhenhua Yang ₁ , Yichen Guo ₁ , Hongfei Li ₁ , Yuchen Zhou ₁ , Xianghao Zuo ₁ , Yingjie Yu ₁ , Cheng Pan ₁ , Joseph Strzalka ₂ , Chang-Yong Nam ₃ , Miriam H. Rafailovich ₁

Affiliation

The role of a tertiary polymer‐based additive is investigated in increasing the efficiency of inverted low bandgap polymer:fullerene bulk heterojunction (BHJ) solar cells. Charge separation in polymer BHJ solar cells relies on the phase separation between electron accepting fullerene derivatives and photoactive polymers. Proper distribution of individual phases of suitable crystallinities within the active layer is a key factor for efficient charge transport/extraction and high photovoltaic performance. Here, it is demonstrated that the minor addition of a tertiary amorphous polymer, polystyrene (PS), with optimized molecular weights can increase the overall photovoltaic efficiency of poly[N‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)]:phenyl‐C₆₁butyric acid methyl ester (PCDTBT:PCBM) inverted BHJ solar cells, through the interfacial‐tension‐driven increase in crystallinities of photoactive phases and redistribution of PCBM molecules away from the top hole‐collecting anode interface. Complementary studies correlating polymer interfacial tension, blend internal structure, charge transport, and photovoltaic characteristics show that tertiary, high molecular‐weight polymers can serve as effective additives for improving the performance of low bandgap polymer solar cells.

中文翻译：

界面张力在聚合物添加剂调控低带隙聚合物本体异质结太阳能电池内部组织中的作用

在提高反向低带隙聚合物：富勒烯本体异质结（BHJ）太阳能电池的效率方面，研究了基于三元聚合物的添加剂的作用。聚合物BHJ太阳能电池中的电荷分离依赖于接受电子的富勒烯衍生物与光敏聚合物之间的相分离。在活性层内适当结晶度的各个相的适当分布是有效电荷传输/提取和高光伏性能的关键因素。在此证明，少量添加具有优化分子量的三元非晶态聚合物聚苯乙烯（PS）可以提高聚[ N -9'-十七烷基-2,7-咔唑-alt-5， 5-（4'，7'-二-2-噻吩基-2'，1'，3'-苯并噻二唑）]：苯基-C ₆₁丁酸甲酯（PCDTBT：PCBM）通过界面张力驱动的光活性相结晶度的增加和PCBM分子从顶部空穴收集阳极界面的重新分布而使BHJ太阳能电池倒置。有关聚合物界面张力，共混物内部结构，电荷传输和光伏特性的补充研究表明，高分子量的第三级聚合物可作为有效的添加剂，以改善低带隙聚合物太阳能电池的性能。

更新日期：2018-06-21

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