光电流
材料科学
共轭体系
吸收(声学)
聚合物
光电子学
活动层
有机太阳能电池
光电探测器
光电导性
聚合物太阳能电池
光化学
化学物理
太阳能电池
纳米技术
图层(电子)
化学
复合材料
薄膜晶体管
作者
Michelle S. Vezie,Sheridan Few,Iain Meager,Galatia K. Pieridou,Bernhard Dörling,Raja Shahid Ashraf,A. R. Goñi,Hugo Bronstein,Iain McCulloch,Sophia C. Hayes,Mariano Campoy‐Quiles,Jenny Nelson
出处
期刊:Nature Materials
[Springer Nature]
日期:2016-05-16
卷期号:15 (7): 746-753
被引量:289
摘要
The specific optical absorption of an organic semiconductor is critical to the performance of organic optoelectronic devices. For example, higher light-harvesting efficiency can lead to higher photocurrent in solar cells that are limited by sub-optimal electrical transport. Here, we compare over 40 conjugated polymers, and find that many different chemical structures share an apparent maximum in their extinction coefficients. However, a diketopyrrolopyrrole-thienothiophene copolymer shows remarkably high optical absorption at relatively low photon energies. By investigating its backbone structure and conformation with measurements and quantum chemical calculations, we find that the high optical absorption can be explained by the high persistence length of the polymer. Accordingly, we demonstrate high absorption in other polymers with high theoretical persistence length. Visible light harvesting may be enhanced in other conjugated polymers through judicious design of the structure. The photocurrent generated in organic photodetectors and solar cells can be enhanced by increasing light absorption in the active layer. It is now shown that an extended persistence length can increase the oscillator strength of conjugated polymers.
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