Ionic liquids with variable cations as cathode interlayer for conventional polymer solar cells

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• 英文论文题名：Ionic liquids with variable cations as cathode interlayer for conventional polymer solar cells
• 论文作者：Wei Yu ; Xin Guo ; Can Li
• 英文论文作者：Wei Yu ; Xin Guo ; Can Li ; State Key Laboratory of Catalysis ; Dalian National Laboratory for Clean Energy ; Dalian Institute of Chemical Physics ; Chinese Academy of Sciences
• 年：2017
• 作者机构：State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences;
• 英文论文关键词：Conventional polymer solar cells ; Ionic liquids ; Cathode interlayer ; Mobility
• 会议召开时间：2017-05-27
• 会议录名称：第四届新型太阳能电池学术研讨会论文集
• 英文会议录名称：Abstract Book of the 4th Conference on New Generation Solar Cells
• 语种：英文
• 分类号：TM914.4
• 学会代码：ZKYQ
• 会议名称：第四届新型太阳能电池学术研讨会
• 会议地点：中国北京
• 主办单位：中国可再生能源学会光化学专业委员会
• 学会名称：中国科学院物理研究所清洁能源实验室
• 页数：1
• 文件大小：751k
• 原文格式：D
• 会议级别：全国

摘要

Interfacial layer materials have been demonstrated to be crucial for high-efficiency polymer solar cells(PSCs).In this work, we use ionic liquid(IL) as cathode interfacial layer(CIL) for highly efficient conventional PSCs(c-PSCs) and investigate functions of ILs with different cations and substituents.Employing IL as the CIL, PBDTTT-C:PC_(71)BM-based c-PSC affords a power conversion efficiency(PCE) of 7.29%, much higher than that without the CIL(2.78%) and that with Ca/Al electrode(6.18%).When the photoactive layer is a PTB7-Th:PC_(71)BM blend, a higher PCE of 8.67% can be obtained.The ILs reduce the energy barrier due to the existence of interfacial dipole in c-PSCs, leading to increased electron and hole mobilities, reduced series resistance and enhanced contact at the cathode interface.Meanwhile, alkyl chain-substituted ILs offer higher fill factor and PCE than aromatic groups-substituted analogue, which is mainly contributed to more balanced electron and hole mobilities.This work suggests that the ILs are qualified candidates as the CIL for c-PSCs and that one should take the substitution effect into account when choosing a CIL from a large library of materials.
Interfacial layer materials have been demonstrated to be crucial for high-efficiency polymer solar cells(PSCs).In this work, we use ionic liquid(IL) as cathode interfacial layer(CIL) for highly efficient conventional PSCs(c-PSCs) and investigate functions of ILs with different cations and substituents.Employing IL as the CIL, PBDTTT-C:PC_(71)BM-based c-PSC affords a power conversion efficiency(PCE) of 7.29%, much higher than that without the CIL(2.78%) and that with Ca/Al electrode(6.18%).When the photoactive layer is a PTB7-Th:PC_(71)BM blend, a higher PCE of 8.67% can be obtained.The ILs reduce the energy barrier due to the existence of interfacial dipole in c-PSCs, leading to increased electron and hole mobilities, reduced series resistance and enhanced contact at the cathode interface.Meanwhile, alkyl chain-substituted ILs offer higher fill factor and PCE than aromatic groups-substituted analogue, which is mainly contributed to more balanced electron and hole mobilities.This work suggests that the ILs are qualified candidates as the CIL for c-PSCs and that one should take the substitution effect into account when choosing a CIL from a large library of materials.

引文

[1]Wei Yu,Lingyu Zhou,Shuwen Yu,Xin Guo*and Can Li*,Org.Electron.,2017,42,387.
    [2]Wei Yu,Linquan Huang,Dong Yang,Ping Fu,Lingyu Zhou,Jian Zhang*and Can Li*,J.Mater.Chem.A,2015,3,10660.
    [3]Ping Fu,Linquan Huang,Wei Yu,Dong Yang,Guiji Liu,Lingyu Zhou,Jian Zhang*and Can Li*,Nano Energy,2015,13,275.