Regulating Bulk-Heterojunction Molecular Orientations through Surface Free Energy Control of Hole-Transporting Layers for High-Performance Organic Solar Cells
Regulating Bulk-Heterojunction Molecular Orientations through Surface Free Energy Control of Hole-Transporting Layers for High-Performance Organic Solar Cells
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通过空穴传输层的表面自由能控制来调节高性能有机太阳能电池的体异质结分子取向
DOI：
10.1002/adma.201806921
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发表时间：
2019
影响因子：
29.4
通讯作者：
Zhou Huiqiong
中科院分区：
文献类型：
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作者：
Wang Jianqiu;Zheng Zhong;Zhang Dongyang;Zhang Jianqi;Zhou Jiyu;Liu Jingchong;Xie Shenkun;Zhao Yong;Zhang Yuan;Wei Zhixiang;Hou Jianhui;Tang Zhiyong;Zhou Huiqiong
界面性能对高性能体异质结有机太阳能电池（osc）至关重要。本文报道了一种通用界面方法，通过在聚（3,4‐乙烯二氧噻吩）：聚（苯乙烯磺酸）（PEDOT:PSS）中引入聚（苯乙烯磺酸）钠盐或二水合甲酸镍，在大范围内调节空穴输运层（HTLs）的表面自由能（γS）。基于优化的γ - sofhtls，并因此改善了bhj的面朝分子排序，富勒烯和非富勒烯OSCs的填充因子和功率转换效率都得到了提高，这是由于减少了重组，增加了载流子迁移率和扫掠率。结果表明，PBDB‐TF:PC71BM、PBDB‐T:PC71BM和PBDB‐TF: It‐4F倾向于γ - s较高的HTLs，而PBDB‐TF:PC71BM、P3HT:PC71BM和PDCBT:ITIC倾向于γ - s较低的HTLs。基于表面性能-形貌-器件性能的相关性，给出了选择合适γ - s的HTL的建议。这项工作丰富了对基于各种BHJ材料的高效osc的界面特性和形态控制的基本理解。
Interface properties are of critical importance for high‐performance bulk‐heterojunction (BHJ) organic solar cells (OSCs). Here, a universal interface approach to tune the surface free energy (γS) of hole‐transporting layers (HTLs) in a wide range through introducing poly(styrene sulfonic acid) sodium salts or nickel formate dihydrate into poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is reported. Based on the optimal γSof HTLs and thus improved face‐on molecular ordering in BHJs, enhanced fill factor and power conversion efficiencies in both fullerene and nonfullerene OSCs are achieved, which is attributed to the increased charge carrier mobility and sweepout with reduced recombination. It is found that the face‐on orientation‐preferred BHJs (PBDB‐TF:PC71BM, PBDB‐T:PC71BM, and PBDB‐TF:IT‐4F) favor HTLs with higher γSwhile the edge‐on orientation‐preferred BHJs (PDCDT:PC71BM, P3HT:PC71BM and PDCBT:ITIC) are partial to HTLs with lower γS. Based on the surface property–morphology–device performance correlations, a suggestion to select a suitable HTL in terms of γSfor a specific BHJ with favored molecular arrangement is provided. This work enriches the fundamental understandings on the interface characteristics and morphological control toward high‐efficiency OSCs based on a wide range of BHJ materials.