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首页> 外文期刊>ACS applied materials & interfaces >Molecular Oriented Charge Accumulation in High-Efficiency Polymer Solar Cells as Revealed by Operando Spin Analysis
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Molecular Oriented Charge Accumulation in High-Efficiency Polymer Solar Cells as Revealed by Operando Spin Analysis

机译：由Operando旋转分析揭示的高效聚合物太阳能电池中的分子取向电荷积累

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摘要

A low band-gap polymer, PTB7-Th, is one of the typical p-type semiconductors among the next-generation solar-cell materials that have achieved power conversion efficiencies of over 10%. However, the internal deterioration mechanism of high-efficiency polymer solar cells such as PTB7-Th-based cells is still an open issue and has been extensively studied. Here, we report a study with operando electron spin resonance (ESR) spectroscopy for PTB7-Th polymer solar cells with an n-type semiconductor PC71BM to clarify the internal deterioration mechanism at a molecular level. We have directly observed ambipolar charge accumulation with a face-on molecular orientation in the cells under simulated solar irradiation using an operando light-induced ESR technique. Moreover, we have found a clear correlation between the charge accumulation and performance deterioration of the cells. The charge accumulation sites have been clarified by the ESR analysis and density functional theory calculation. The prevention of such charge accumulation on the basis of the present finding would be important for the commercialization of high-efficiency polymer solar cells.
机译：低带间隙聚合物PTB7-TP，是下一代太阳能电池材料中的典型P型半导体之一，其实现了超过10％的功率转换效率。然而，高效聚合物太阳能电池如PTB7-TH电池的内部劣化机理仍然是一个开放的问题，并且已被广泛研究。在这里，我们向PTB7-TH聚合物太阳能电池进行了HORMANDO电子自旋共振（ESR）光谱的研究，其中N型半导体PC71BM以分子水平阐明内部劣化机构。我们使用Operando光诱导ESR技术直接观察到模拟太阳辐射的细胞面对细胞面对细胞面对的Amipolar电荷积累。此外，我们发现电荷累积和细胞性能劣化之间的明显相关性。通过ESR分析和密度泛函理论计算阐明了电荷累积站点。基于本发现的预防性累积对于高效聚合物太阳能电池的商业化是重要的。

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