电荷转移状态解离效率可以限制低偏移有机太阳能电池的免费电荷产生
Jolanda Simone Müller1, Marc Comí2, Flurin Eisner1
1Department of Physics and Centre for processable Electronics, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, United Kingdom.
ACS energy letters
|August 17, 2023
概括
优化有机太阳能电池需要平衡能量水平. 低偏移降低了电压损失,但通过限制电荷转移状态解离,阻碍光电流,影响整体性能.
科学领域:
- 有机电子学有机电子学
- 太阳能光伏发电是如何实现的
- 材料科学是一种材料科学.
背景情况:
- 有机散装异质连接太阳能电池是有前途的可再生能源设备.
- 性能通常受到充电生成过程的限制.
- 调节供体-接受体能量水平对于效率至关重要.
研究的目的:
- 调查低抵消性有机太阳能电池的充电生成限制.
- 了解电离能 (IE) 抵消对设备性能的影响.
- 确定影响小IE偏移光电流生成的关键因素.
主要方法:
- 合成了一系列PBDB-T衍生物供体聚合物,具有可调节的IE.
- 将聚合物与Y6受体混合在一起,以创建批量异质连接.
- 采用了光电子和光谱测量.
- 利用了分子和设备级建模.
主要成果:
- 实现了从0.22到0.59 eV的捐赠者-接受器IE偏移 (ΔE_IE) 的范围.
- 小 ΔE_IE 减少了非辐射电压损失,但抑制了光电流.
- 在低 ΔE_IE 时观察到局部刺激子解离效率下降.
- 发现电荷转移 (CT) 状态分离效率显著降低.
结论:
- 电荷转移状态分离的差异限制了低补偿有机太阳能电池的性能.
- 平衡IE偏移对于高效的充电生成和设备性能至关重要.
- 这项工作为优化有机太阳能电池设计提供了洞察力.
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