松散的激发与增强的移位能力 提高有机太阳能电池的效率
Qing Shen1, Chengliang He1, Shuixing Li2
1State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 5, 2024
概括
在有机太阳能电池 (OSC) 中降低激子结合能量和增加激子脱位,显著提高了效率. 这种分子设计策略使得新接受器材料的功率转换效率达到19.07%.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 太阳能光伏发电是如何实现的
背景情况:
- 有机太阳能电池 (OSC) 已经通过各种电子受体设计进化,从富勒衍生物到非富勒受体 (NFAs).
- 最近的Y系列NFAs已经实现了超过19%的效率,但进一步改进的精确分子设计原则仍然不清楚.
研究的目的:
- 确定负责提高有机太阳能电池接受器效率的关键分子性质.
- 设计和合成一种具有优化性能的新型不对称接受器 (BTP-H5).
主要方法:
- 对代表性受体 (PC71BM,IT-4F,L8-BO) 的比较分析,代表不同的发育阶段.
- 设计和合成一个新的不对称接受器,BTP-H5.5.
- 激子结合能 (Eb) 和激子移位能力的评估.
主要成果:
- 显著降低刺激子结合能 (Eb) 和增强刺激子外定位被认为对性能至关重要.
- 与PC71BM相比,BTP-H5在Eb中减少了100meV,并且电子孔对距离翻了一番.
- OSC效率从S-Q限值的40%提高到60%,BTP-H5实现了19.07%的效率.
结论:
- 减少刺激子结合能和增强刺激子移位被证实是提高OSC效率的关键因素.
- 这些发现提供了对激励脱局在OSC表现中的作用的定量理解.
- 这项工作为未来高性能有机太阳能电池接受器的分子设计提供了宝贵的见解.
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