Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties,Advanced Energy Materials

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Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-03-20 , DOI: 10.1002/aenm.201904234
Lei Zhu _{1,

2,

3} , Ming Zhang ₄ , Guanqing Zhou ₄ , Tianyu Hao ₄ , Jinqiu Xu ₄ , Jing Wang ₅ , Chaoqun Qiu ₁ , Nathaniel Prine ₆ , Jazib Ali ₄ , Wei Feng ₇ , Xiaodan Gu ₆ , Zaifei Ma ₅ , Zheng Tang ₅ , Haiming Zhu ₈ , Lei Ying _{2,

3} , Yongming Zhang ₁ , Feng Liu _{1,

4}

Affiliation

Single‐layered organic solar cells (OSCs) using nonfullerene acceptors have reached 16% efficiency. Such a breakthrough has inspired new sparks for the development of the next generation of OSC materials. In addition to the optimization of electronic structure, it is important to investigate the essential solid‐state structure that guides the high efficiency of bulk heterojunction blends, which provides insight in understanding how to pair an efficient donor–acceptor mixture and refine film morphology. In this study, a thorough analysis is executed to reveal morphology details, and the results demonstrate that Y6 can form a unique 2D packing with a polymer‐like conjugated backbone oriented normal to the substrate, controlled by the processing solvent and thermal annealing conditions. Such morphology provides improved carrier transport and ultrafast hole and electron transfer, leading to improved device performance, and the best optimized device shows a power conversion efficiency of 16.88% (16.4% certified). This work reveals the importance of film morphology and the mechanism by which it affects device performance. A full set of analytical methods and processing conditions are executed to achieve high efficiency solar cells from materials design to device optimization, which will be useful in future OSC technology development.

中文翻译：

高效的有机太阳能电池，具有精细的受体结晶和形态，可实现16.88％的效率，并具有改善的电荷转移和传输性能

使用非富勒烯受体的单层有机太阳能电池（OSC）的效率已达到16％。这样的突破为下一代OSC材料的开发激发了新的火花。除了优化电子结构外，重要的是研究指导固态异质结共混物高效化的基本固态结构，这对于理解如何配对有效的供体-受体混合物并改善薄膜形态具有重要意义。在这项研究中，进行了彻底的分析以揭示形态学细节，结果表明Y6可以形成独特的2D堆积，其聚合物样共轭骨架的取向垂直于基材，并受加工溶剂和热退火条件的控制。这种形态提供了改善的载流子传输以及超快的空穴和电子转移，从而改善了器件性能，最佳优化的器件显示了16.88％的功率转换效率（经认证的16.4％）。这项工作揭示了膜形态的重要性以及影响器件性能的机理。从材料设计到设备优化，执行全套分析方法和处理条件以实现高效太阳能电池，这将在未来OSC技术开发中很有用。

更新日期：2020-03-20

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