[1]王艺林,周科,马伟.顺序加工有机光伏器件的相分离及结晶性调控[J].中国材料进展,2022,41(03):161-168.[doi:10.7502/j.issn.1674-3962.202202006]
　WANG Yilin,ZHOU Ke,MA Wei.Control of the Crystallization and Phase Separation in Sequential Blade Coated Organic Solar Cells[J].MATERIALS CHINA,2022,41(03):161-168.[doi:10.7502/j.issn.1674-3962.202202006]
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顺序加工有机光伏器件的相分离及结晶性调控()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
41
期数:
2022年第03期
页码:
161-168
栏目:
出版日期:
2022-03-30

文章信息/Info

Title:
Control of the Crystallization and Phase Separation in Sequential Blade Coated Organic Solar Cells
文章编号:
1674-3962(2022)03-0161-08
作者:
王艺林; 周科; 马伟
（西安交通大学材料科学与工程学院 金属强度国家重点实验室，陕西 西安 710049）
Author(s):
WANG Yilin; ZHOU Ke; MA Wei
（State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China）
关键词:
有机太阳能电池; 顺序刮涂; 形貌; 结晶; 垂直相分离; 大面积器件
Keywords:
organic solar cells; sequential blade coating; morphology; crystallization; vertical phase separation; large-area devices
分类号:
TM914.4;TN15;O631.4
DOI:
10.7502/j.issn.1674-3962.202202006
文献标志码:
A
摘要:
活性层形貌对有机光伏器件性能有重要影响，在本体异质结（BHJ）结构中，活性层微观形貌复杂，难以精确调控。相比之下，顺序加工P-i-N结构可以单独加工给/受体，使得形貌调控更简单易行。然而，目前顺序加工形貌优化的相关机理研究相对缺乏，不利于其在大面积器件中的应用。基于此，采用顺序刮涂制备了基于PM6/Y6体系的P-i-N结构器件，并对其基于形貌优化提高器件性能的机理进行了研究。与BHJ结构相比，顺序刮涂薄膜从阳极到阴极形成了给体富集相/共混相/受体富集相的梯度分布结构；同时，顺序刮涂有效提升了给/受体的结晶性。梯度分布结构和结晶性的协同优化使得器件中的电荷迁移率更加平衡，载流子复合减少，电荷收集效率提高，因此获得了最高15.84%的光电转化效率（BHJ结构15.16%）。更为重要的是，通过进一步优化大面积顺序刮涂工艺，活性层形貌缺陷减少，从而有效降低了大面积器件效率损失。以上结果表明了顺序刮涂策略在实现活性层形貌优化和制备高效大面积器件方面的巨大潜力。
Abstract:
The bulk heterojunction (BHJ) morphology of organic solar cells (OSCs) is critically important for achieving high device performance. While the microstructure optimization in a single casting process is extremely complicated due to the coupling of crystallization and phase separation of the photoactive materials. By contrast, the sequential blade coated P-i-N structure of the donor and acceptor materials can lead to a more favorable morphology and nanostructure, which is an efficient method to circumvent the existing issue in single-solvent BHJ device fabrication. However, the underlying mechanism of morphology optimization in sequential blade coating process and how it impacts the device performance are still mysterious, which limit the application of this method in the manufacture of high-efficiency large-area devices. Herein, the inverted P-i-N device based on PM6/Y6 system was fabricated in ambient environment and the mechanism of improved device performance based on morphology optimization was studied in detail. Compared to the single-solvent method, sequential blade coating strategy successfully controlled the crystallization and phase separation of active layer, and the gradient distribution of donor-rich phase/mixing phase/acceptor-rich phase from anode to cathode was formed. More importantly, this strategy eliminated the interaction between donor and acceptor molecules, thus effectively enhanced the crystallinity of donor and acceptor. Based on the simultaneous optimization of vertical phase separation and crystallinity, more balanced hole/electron mobility and reduced carrier recombination were achieved, leading to the highest power conversion efficiency (PCE) of 15.84% in P-i-N device (15.16% for the BHJ control device). It is worth noting that by further optimizing the large-area sequential blade coating process, the morphologic defects of large-area active layer were effectively reduced, resulting in higher PCE of large-area P-i-N device. This indicates the sequential blade coating strategy provides an important guideline for the optimization of large-area fabrication in OSCs.

备注/Memo

备注/Memo:
收稿日期：2022-02-08 基金项目：国家自然科学基金资助项目（52173023，21875182）；陕西省科技创新重点团队项目（2020TD002）；111项目2.0（BP2018008）第一作者：王艺林，女，1992年生，博士通讯作者：马伟，男，1983年生，教授，博士生导师， Email: msewma@xjtu.edu.cn
更新日期/Last Update: 2022-02-25