The Intrinsic Role of Molecular Mass and Polydispersity Index in High‐Performance Non‐Fullerene Polymer Solar Cells,Advanced Energy Materials

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The Intrinsic Role of Molecular Mass and Polydispersity Index in High‐Performance Non‐Fullerene Polymer Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-11-23 , DOI: 10.1002/aenm.202002709
Mumin Shi ₁ , Tao Wang ₁ , Yao Wu ₁ , Rui Sun ₁ , Wei Wang ₁ , Jing Guo ₁ , Qiang Wu ₁ , Wenyan Yang ₁ , Jie Min _{1,

2,

3}

Affiliation

The degree of polymerization can cause significant changes in the blend microstructure and physical mechanism of the active layer of non‐fullerene polymer solar cells, resulting in a huge difference in device performance. However, the diversity of stability issues, including photobleaching stability, storage stability, photostability, thermal stability, and mechanical stability, and more, poses a challenge for the degree of polymerization to comprehensively address the trade‐off between device efficiency and stability and reasonably evaluate the application potential of polymer materials. Herein, a series of PM6 polymers with different weight‐average molecular weights (M_w) and polydispersity index (PDI) are synthesized. The effects of the degree of PM6 polymerization on the efficiency and degradation behaviors of the photovoltaic systems based on Y6 as acceptor are investigated systematically. The findings regarding stability issues, together with the trade‐offs in the efficiency‐stability gap, formulate a complete guideline for the material design and performance evaluation in a way that relies much less on trial‐and‐error efforts.

中文翻译：

分子质量和多分散指数在高性能非富勒烯聚合物太阳能电池中的内在作用

聚合度可能会导致非富勒烯聚合物太阳能电池活性层的共混微观结构和物理机制发生重大变化，从而导致器件性能产生巨大差异。但是，稳定性问题的多样性，包括光漂白稳定性，储存稳定性，光稳定性，热稳定性和机械稳定性等，对聚合度提出了挑战，要全面解决器件效率和稳定性之间的折衷问题并合理评估高分子材料的应用潜力。本文中，一系列重均分子量（M _w）和多分散指数（PDI）进行了合成。系统研究了PM6聚合度对以Y6为受主的光伏系统效率和降解行为的影响。有关稳定性问题的发现以及效率与稳定性差距的取舍，以较少依赖反复试验的方式，制定了材料设计和性能评估的完整指南。

更新日期：2021-01-07

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