Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties
Efficient Organic Solar Cell with 16.88% Efficiency Enabled by Refined Acceptor Crystallization and Morphology with Improved Charge Transfer and Transport Properties
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Efficient%20Organic%20Solar%20Cell%20with%2016.88%%20Efficiency%20Enabled%20by%20Refined%20Acceptor%20Crystalization%20and%20Morphology%20with%20Improved%20Charge%20Transfer%20and%20Transport%20属性
DOI：
10.1002/aenm.201904234
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发表时间：
2020-03-20
影响因子：
27.8
通讯作者：
Liu, Feng
中科院分区：
文献类型：
--
作者：
Zhu, Lei;Zhang, Ming;Liu, Feng
使用非富勒烯受体的单层有机太阳能电池(OSCs)效率达到16%。这样的突破为下一代OSC材料的发展激发了新的火花。除了优化电子结构外，重要的是研究引导体异质结共混物高效率的基本固态结构，这为理解如何配对有效的供体-受体混合物和改善薄膜形态提供了见解。在本研究中，进行了深入的分析以揭示形貌细节，结果表明Y6可以形成独特的二维填料，具有类似聚合物的共轭骨架，取向于衬底，受加工溶剂和热退火条件的控制。这种形貌改善了载流子输运和超快空穴和电子转移，从而提高了器件性能，优化后的器件功率转换效率为16.88%（认证为16.4%）。这项工作揭示了薄膜形态的重要性及其影响器件性能的机制。从材料设计到器件优化，为实现高效太阳能电池提供了一整套分析方法和工艺条件，为未来太阳能电池技术的发展提供了参考。
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.