理解多尺度形貌中的共混相结构以制备高性能光伏电池  

Understanding the Mixing Phase Structure in Multi-length-scale Morphology to Arrest High-performance Photovoltaic Devices

作　　者：张明 钟文楷 钱诗赟 吕博赛 周冠清 薛晓南 周子春 史志文 朱磊 张永明[1,3] 刘烽 ZHANG Ming;ZHONG Wenkai;QIAN Shiyun;LYU Bosai;ZHOU Guanqing;XUE Xiaonan;ZHOU Zichun;SHI Zhiwen;ZHU Lei;ZHANG Yongming;LIU Feng(School of Chemistry and Chemical Engineering,Frontiers Science Center for Transformative Molecules,In-situ Center for Physical Science,Center of Hydrogen Science;Key Laboratory of Artificial Structures and Quantum Control,Ministry of Education,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Fluorinated Functional Membrane Materials,Dongyue Future Hydrogen Energy Materials Company,Zibo 256401,China)

机构地区：[1]上海交通大学化学化工学院,变革性分子前沿中心,原位物质科学中心,氢科学中心 [2]上海交通大学人工结构与量子控制教育部重点实验室,物理与天文学院,上海200240 [3]东岳未来氢能材料公司含氟功能膜材料国家重点实验室,淄博256401

出　　处：《高等学校化学学报》2023年第7期159-169,共11页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:51973110,22109094);中国博士后科学基金(批准号:2022M722072,2022T150406)资助.

摘　　要：将PC_(71)BM引入J51∶N2200和PM6∶Y6两个典型的有机光伏系统中,研究了共混相的性质.研究结果表明,共混相中的激子离解和载流子传输过程是影响器件光电转换效率的关键.在J51∶N2200∶PC_(71)BM共混薄膜中,PC_(71)BM在共混相内的聚集会引入能量势垒抑制空穴转移过程.同时,双纤维网络之间间隙的扩大限制了解离后的电子和空穴在共混区内的有效扩散,从而导致较为严重的复合和能量损失.而在PM6∶Y6∶PC_(71)BM共混薄膜中,引入的PC_(71)BM分子均匀分布在共混相中,并能与PM6和Y6分子较好地混合.同时,PC_(71)BM的加入不会干扰Y6到PM6的空穴转移,并增强了共混相的双极性传输特性.这种形貌非常有优势,其中存在大量的给受体界面,且产生的电子和空穴可以迅速扩散,并在晶相中高速传输至电极.该结果揭示了在多尺度形貌调控中共混相结构的重要性,是下一阶段有机太阳能电池效率超过20%需要重点考虑的问题.The properties of the mixing phase are investigated in detail by introducing PC_(71)BM into two typical organic photovoltaic blends J51∶N2200 and PM6∶Y6.It is found that the process of exciton dissociation and carrier transport in the mixing zone play a key role in determining the power conversion efficiency.In J51∶N2200∶PC_(71)BM blend,the aggregation of PC_(71)BM in the mixing zone brings in energetic barrier to inhibit the hole transfer process.In the meanwhile,the enlarged intervals in-between the double fibril network limit the effective diffusion of the split electrons and holes in the mixing zone,leading to large recombination and energy loss.While in PM6∶Y6∶PC_(71)BM blend,the introduced PC_(71)BM could homogeneously distribute in the amorphous zone,mixing well with PM6 and Y6 molecules.Meanwhile,the addition of PC_(71)BM does not perturb the hole transfer from Y6 to PM6.Such a morphology is advantageous where electrons and holes generated at abundant donor/acceptor interface could diffuse out rapidly,and transport in the crystalline pathway towards the corresponding electrodes.Such results reveal the importance of manipulating the mixing phase structure in the multi-length-scale morphology,of high demand towards 20%efficiency in the next episode organic solar cell(OSC)development.

关 键 词：共混相 多尺度形貌 有机光伏 光电转换效率 

分 类 号：O631[理学—高分子化学]