Unraveling the Complex Nanomorphology of Ternary Organic Solar Cells with Multimodal Analytical Transmission Electron Microscopy
Unraveling the Complex Nanomorphology of Ternary Organic Solar Cells with Multimodal Analytical Transmission Electron Microscopy
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DOI：
10.1002/solr.202000114
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发表时间：
2020-03
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通讯作者：
S. Rechberger;Nicola Gasparini;Ranbir Singh;M. Kim;C. Chochos;V. Gregoriou;Kilwon Cho;C. Brabec;T. Ameri;E. Spiecker
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文献类型：
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作者：
S. Rechberger;Nicola Gasparini;Ranbir Singh;M. Kim;C. Chochos;V. Gregoriou;Kilwon Cho;C. Brabec;T. Ameri;E. Spiecker
阐明三元有机太阳能电池活性层中复杂材料的分布是有机光致发光领域的最大挑战之一。纳米形态学的知识是理解生物物理过程的关键（例如，电荷分离、复合机制的调节以及无辐射和能量损失的抑制），从而改善器件性能。在此，第一次，成功的歧视和空间映射的三元有机太阳能电池的活性层组件证明使用分析透射电子显微镜。所有三种有机组分的材料分布通过使用互补电子能量损失信号的多模态成像成功地可视化。通过研究横向和横截面形态以及形态演变作为聚合物混合比的函数，可以获得形态方面的完整图像。最后，实现了三元和参考二元系统的形态，物理过程和器件性能之间的相关性，解释了两个系统之间的功率转换效率的差异。
Elucidating the complex materials distribution in the active layers of ternary organic solar cells is one of the greatest challenges in the field of organic photovoltaics. Knowledge of the nanomorphology is key to understanding photophysical processes (e.g., charge separation, adjustment of the recombination mechanism, and suppression of the radiationless and energetic losses) and thus improving the device performance. Herein, for the first time, the successful discrimination and spatial mapping of the active layer components of a ternary organic solar cell are demonstrated using analytical transmission electron microscopy. The material distribution of all three organic components is successfully visualized by multimodal imaging using complementary electron energy loss signals. A complete picture of the morphological aspects can be gained by studying the lateral and cross‐sectional morphology as well as the morphology evolution as a function of the mixing ratio of the polymers. Finally, a correlation between the morphology, photophysical processes, and device performance of the ternary and the reference binary system is achieved, explaining the differences of the power conversion efficiency between the two systems.