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Circularly polarized coherent light-induced boosting of polymer solar cells photovoltaic performance
New Journal of Physics ( IF 3.3 ) Pub Date : 2020-10-15 , DOI: 10.1088/1367-2630/abbf22
Longlong Zhang 1 , Yuying Hao 1 , Wei Qin 2 , Shijie Xie 2 , Fanyao Qu 3
Affiliation  

We report a microscopic quantum theory which can be used to study circularly polarized light (CPL) induced singlet to triplet conversions in polymer solar cells (PSCs). We demonstrate that by properly adjusting CPL irradiation parameters, the photo-created singlet excitons can be efficiently converted into non radiative triplet excitons. The maximum singlet–triplet conversion ratio might be reached when the incident CPL frequency is chosen in such a way that the resonant optical excitation occurs between singlet and triplet states. In addition, we also illustrate that with varying CPL oscillating strength, the singlet–triplet conversion patterns behave as the Rabi oscillations and the steadily maintained triplet excitons. The electron-lattice coupling leads to the self-trapping of the excitons, which enhances the coherence between the electron’s and hole’s spin oscillations. This study opens up a novel approach for enhancing and controlling the photovoltaic response of PSCs by a...

中文翻译:

圆偏振相干光诱导聚合物太阳能电池的光伏性能

我们报告了一种微观量子理论,该理论可用于研究聚合物太阳能电池(PSC)中的圆偏振光(CPL)诱导的单重态到三重态转换。我们证明通过适当地调整CPL辐照参数,可以将光创建的单重态激子有效地转换为非辐射三重态激子。当以这样的方式被选择的事件CPL频率单线态和三重态之间发生谐振光学激发可能达到的最大单重态 - 三重态转化率。此外,我们还说明了在CPL振荡强度变化的情况下,单重态-三重态转换模式表现为Rabi振荡和稳定维持的三重态激子。电子-晶格耦合导致激子的自陷,这增强了电子和空穴的自旋振荡之间的相干性。这项研究开辟了一种新的方法,通过一种增强和控制PSC的光伏响应的方法。
更新日期:2020-10-19
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