替代剂减少了聚合物太阳能电池中的电荷重组和驱动结构和形态的发展
Andrew C Stuart1, John R Tumbleston, Huaxing Zhou
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States.
Journal of the American Chemical Society
|January 8, 2013
概括
聚合物中的替代显著提高有机太阳能电池的性能,通过改善开通电路电压和填充因子. 这可以通过抑制电荷重组和优化形态来实现,从而提高功率转换效率.
科学领域:
- 材料科学 材料科学 材料科学
- 有机电子 有机电子
- 聚合物化学 聚合物化学
背景情况:
- 有机太阳能电池 (OSC) 是一个有前途的可再生能源技术.
- 调整聚合物特性对于提高OSC效率至关重要.
- 替代是一种常见的策略,用于修改有机半导体的电子和形态特性.
研究的目的:
- 研究替代对OSCsBnDT-DTBT基聚合物的性能的影响.
- 了解对开放电路电压 (Voc),短路电流 (Jsc) 和填充因子 (FF) 的影响.
- 将结构和形态变化与设备性能相关联.
主要方法:
- 三种结构相同的聚合物的合成,含有不同的含量 (0, 1 或 2 个替代).
- 使用这些聚合物制造有机太阳能电池的制造和表征.
- 使用诸如变光强度研究,放牧发生率广角X射线散射 (GIWAXS) 和小角X射线散射 (R-SoXS) 等技术分析聚合物特性.
主要成果:
- 增加的替代导致HOMO水平降低,增强了Voc.
- 替代抑制了双分子和双酸电荷重组,改善了Jsc和FF.
- GIWAXS 揭示了一个更面对面的聚合物晶体质定向,随着含量的增加.
- R-SoXS显示出更大,更纯的聚合物/富勒烯域,PCBM混合性降低.
结论:
- 替代是一种通过优化电子和形态特性来提高OSC性能的有效策略.
- 该研究解释了研究聚合物的效率从4%提高到7%.
- 在未来设计用于有机电子的高性能聚合物半导体时,替代应该是关键考虑因素.
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