高效聚合物太阳能电池在甲基化聚合物供应器和化受体之间具有高效孔移位的最高占成的分子轨道抵消
Chenkai Sun1,2, Shucheng Qin1,2, Rui Wang3
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids , Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190 , China.
Journal of the American Chemical Society
|January 7, 2020
概括
高性能聚合物太阳能电池 (PSC) 使用具有零最高占有分子轨道 (HOMO) 偏移的新型捐赠者-接受器对实现16.32%的功率转换效率 (PCE). 这一突破表明高效的电荷传输是可能的,即使能量水平差异很小,推进PSC技术.
科学领域:
- 材料科学
- 有机电子
- 太阳能发电
背景情况:
- 对于高性能聚合物太阳能电池 (PSC) 来说,在小边界分子轨道偏移时有效的电荷转移至关重要.
- 优化捐赠-接受器能量水平是最大限度地提高PSC功率转换效率的关键.
研究的目的:
- 合成和评估一个新的宽带间隙聚合物供体 (PTQ11) 和一个新的低带间隙受体 (TPT10).
- 研究基于PTQ11-TPT10系统的PSC的性能,其中最大占用分子轨道 (HOMO) 的偏移为零.
- 了解电荷转移动态和导致PSC中高PCE且HOMO偏移为零的因素.
主要方法:
- 新型宽带间隙聚合物供体PTQ11和低带间隙受体TPT10的合成
- 基于PTQ11-TPT10的聚合物太阳能电池的制造和特征.
- 对边界分子轨道能量水平 (HOMO和LUMO) 和设备性能指标 (PCE,Voc,Jsc,FF) 的分析.
主要成果:
- 基于PTQ11-TPT10的PSC实现了高功率转换效率 (PCE) 的16.32%.
- 该装置在捐赠者和接受者之间显示了零最高占有分子轨道 (HOMO) 偏移 (ΔEHOMO(D-A) ).
- 该PSC表现出卓越的性能,高开通电压 (Voc) 为0.88V,大短路电流密度 (Jsc) 为24.79mA cm-2,高填充系数 (FF) 为74.8%.
结论:
- 在没有HOMO偏移的PSC中,可以实现高效的激素解离和孔转移.
- 开发的PTQ11-TPT10系统证明了在PSC中实现高PCE的可行性,而无需显著的能量水平抵消.
- 这些发现提供了有关负担转移机制的有价值的见解,并为开发高效的PSC提供了有希望的策略.
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