在非富勒烯有机太阳能电池中,替代用于介电常数改善和孔转移加速
Xinjun He1, Feng Qi2,3,4, Xinhui Zou5
1Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, China.
Nature communications
|March 7, 2024
概括
在非富勒受体中替代增强有机太阳能电池的介电常数. 这种修改改善了刺激子动态,减少了重组,导致功率转换效率达到19.0%.
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:
- 非富勒烯受体 (NFAs) 的介电常数对于有机太阳能电池 (OSC) 的性能至关重要,它会影响激子解离和电荷重组.
- 现有的电常数为3-4的NFAs表现出显著的重组损失.
研究的目的:
- 研究替代对NFAs的介电常数的影响.
- 了解修改过电常数如何影响OSC中的激子动力学和电荷重组.
- 优化NFA形态,以提高设备性能.
主要方法:
- 用替代的NFAs的合成和与基于硫的衍生物的比较.
- 使用检测电荷转移和再组合动态的技术 (例如,短暂吸收光谱) 进行混合膜的表征.
- 包含修改后的NFAs的三元有机太阳能电池设备的制造和表征.
主要成果:
- 替代有效地增加了NFAs的介电常数.
- 与S-NFA混合物 (~10 ps) 相比,Se-NFA混合物中观察到更快的孔转移 (~5 ps).
- 在Se-NFA混合物中的无序堆叠导致了更快的电荷重组,但在三元系统中的优化减轻了这一问题.
- 具有优化Se-NFA形态的三元器件实现了0.221 eV的非辐射重组能量损失降低和19.0%的高功率转换效率.
结论:
- 异原子替代,特别是用,是一种可行的策略,可以增强NFAs的介电常数.
- 优化形态与介电常数改进一起,对于最小化重组损失和最大化OSC效率至关重要.
- 这项研究提供了对高性能有机太阳能电池的材料设计的见解.
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