采用富勒烯和苝二酰亚胺电子受体的有机共混薄膜中电荷分离动力学的比较
A Comparison of Charge Separation Dynamics in Organic Blend Films Employing Fullerene and Perylene Diimide Electron Acceptors.
作者信息
Shoaee Safa, Deledalle Florent, Shakya Tuladhar Pabitra, Shivanna Ravichandran, Rajaram Sridhar, Narayan K S, Durrant James R
机构信息
†Centre for Plastic Electronics, Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom.
‡Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560064, India.
出版信息
J Phys Chem Lett. 2015 Jan 2;6(1):201-5. doi: 10.1021/jz502385n. Epub 2014 Dec 24.
We report a comparison of charge carrier dynamics and device performance for low band gap polymer PBDTTT-CT in blends with the fullerene acceptor PC71BM and a PDI derivative with similar electron affinities. Charge separation and recombination dynamics are found to be remarkably similar for these two acceptors, with both blends exhibiting efficient, ultrafast charge separation (time constants of 1.6 and 1.4 ps, respectively). The lower device performance for the PDI acceptor (1.75% compared to 3.5% for the equivalent PC71BM device) is shown to result from slower charge transport, increasing nongeminate recombination losses during charge collection.
我们报告了低带隙聚合物PBDTTT-CT与富勒烯受体PC71BM以及具有相似电子亲和力的PDI衍生物共混物中电荷载流子动力学和器件性能的比较。发现这两种受体的电荷分离和复合动力学非常相似，两种共混物均表现出高效、超快的电荷分离（时间常数分别为1.6和1.4皮秒）。结果表明，PDI受体的器件性能较低（1.75%，而同等PC71BM器件为3.5%）是由于电荷传输较慢，在电荷收集过程中增加了非成对复合损失。
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