通过单向扩展提高化环电子接收器的性能
Boyu Jia1, Jing Wang2, Yao Wu3
1Department of Materials Science and Engineering, College of Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education , Peking University , Beijing 100871 , China.
Journal of the American Chemical Society
|November 8, 2019
概括
设计具有扩展化环系统的新型非烯受体可显著提高有机光伏性能. 在AOIC的单向扩展实现了最高的充电流动性和功率转换效率.
科学领域:
- 有机电子产品
- 材料科学
- 太阳能发电
背景情况:
- 在非富勒烯接受器中扩展化环系统可以增加合长度,从而实现可调节的电子特性.
- 之前的研究集中在有机电子材料的各种分子设计上.
研究的目的:
- 设计和合成具有单向和双向扩展的化环系统的新型非烯受体.
- 将这些新受体的电子特性和光伏性能与母分子进行比较.
主要方法:
- 融合环非富勒烯受体的合成:AOIC (融合-8环,单向),IUIC2 (融合-11环,双向) 和F5IC (融合-5环,母体).
- 电子属性的表征,包括能量水平,吸收光谱和电荷载体的移动性.
- 使用这些与供体PTB7-Th混合的接受器制造和测试有机光伏电池.
主要成果:
- 分子扩展转移了能量水平,红移吸收光谱,并减少了带隙.
- 单向扩展的AOIC显示出最高的电荷移动性 (2.1 × 10−3 cm2 V−1 s−1).
- 基于AOIC的OPV电池实现了13.7%的功率转换效率,明显优于F5IC (5.61%) 和IUIC2 (4.48%).
结论:
- 化环系统的单向扩展是开发高性能非烯受体的一个有前途的策略.
- 分子设计,特别是化环延伸的方向性,对电荷传输和OPV设备的效率产生了重大影响.
- 设计的AOIC接受器显示了有机太阳能电池高效应用的潜力.
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