全聚合物电池相分离形貌和分子取向调控
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- 英文论文题名：Adjustment of Morphology and Molecular Orientation in Conjugated Polymer Blend Solar Cells
- 论文作者：韩艳春
- 英文论文作者：Yanchun Han ; Changchun Institute of Applied Chemistry ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院长春应用化学研究所;
- 论文关键词：全聚合物电池 ; 相分离形貌 ; 相区尺寸 ; 结晶取向 ; 器件性能
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十二分会：有机光伏的机遇和挑战
- 语种：中文
- 分类号：TM910
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十二分会 ; 有机光伏的机遇和挑战
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：166k
- 原文格式：D
- 会议级别：全国
摘要
全聚合物体系电池的受体材料为共轭聚合物,因而与小分子受体材料体系相比,具有更有效的光吸收和较高的开路电压。然而,全聚合物电池的激子分离效率为7×10-3,远低于富勒烯体系的激子分离效率(0.12),其原因可以归结为较差的相分离形貌和不同的给受体分子取向。在本文中,我们实现了薄膜互穿网络结构的调控。随着共混比例从10/90到90/10,我们发现薄膜形貌会在双连续,孤岛和共混之间转变。随着成膜时间增长,相区之间融合,相区尺寸增大,据此制备了P3HT/PF12TBT共混体系的相图。其次,我们通过调节溶液状态和成膜动力学促使PTB7-th/PNDI体系形成face-on/face-on取向。PTB7-th分子在不同溶剂制备的薄膜中始终形成face-on取向。而随着溶液聚集增多和成膜时间降低,PNDI分子的face-on取向逐渐增多。由于具有相同取向的给受体界面更有利于激子分离,导致器件性能由0.53%提高到3.52%。聚合物共混相图的制备可为直接获得所需的相分离形貌提供指导,而分子取向的调控则表明可从分子排列角度进一步优化聚合物共混体系的器件性能。
All-polymer solar cells have attracted much interest due to the possibility of achieving high open-circuit voltage and more efficient light absorption compared to polymer/fullerene blend system. However, the phase-separated morphology is uncontrollable for some polymer/polymer blend systems and active layer exhibits different molecular orientation for donor and acceptor, which are not benefit for excitons dissociation. Here, we investigated the phase separation mechanism of polymer blend via adjusting composition ratio and film drying time and depicted a phase diagram of the polymer blend. Meanwhile, by changing solution state and film drying time, we obtained the face-on/face-on molecular orientation for donor and acceptor, which could be benefit for efficient dissociation of excitons.
All-polymer solar cells have attracted much interest due to the possibility of achieving high open-circuit voltage and more efficient light absorption compared to polymer/fullerene blend system. However, the phase-separated morphology is uncontrollable for some polymer/polymer blend systems and active layer exhibits different molecular orientation for donor and acceptor, which are not benefit for excitons dissociation. Here, we investigated the phase separation mechanism of polymer blend via adjusting composition ratio and film drying time and depicted a phase diagram of the polymer blend. Meanwhile, by changing solution state and film drying time, we obtained the face-on/face-on molecular orientation for donor and acceptor, which could be benefit for efficient dissociation of excitons.
引文
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[2]Liu X.;Huettner S.;Rong Z.;Sommer M.;Friend R.Adv.Mater.2012,24:669.
[3]Zhou K.;Liu J.;Li M.;Yu X.;Xing R.;Han Y.J.Phys.Chem.C 2015,119:1729.
[4]Zhou K.;Zhang R.;Liu J.;Li M.;Yu X.;Xing R.;Han Y.ACS Appl.Mater.Interfaces 2015,7:25352.