Unprecedented Efficiency Increase in a Ternary Polymer Solar Cell Exhibiting Polymer-Mediated Polymorphism of a Non-Fullerene Acceptor
Unprecedented Efficiency Increase in a Ternary Polymer Solar Cell Exhibiting Polymer-Mediated Polymorphism of a Non-Fullerene Acceptor
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DOI：
10.1021/acsmaterialslett.2c00823
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发表时间：
2022-11
影响因子：
11.4
通讯作者：
Qing Wan;Liwei Ye;B. Thompson
中科院分区：
文献类型：
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作者：
Qing Wan;Liwei Ye;B. Thompson
在非富勒烯受体(NFA)和三元混合策略的辅助下，聚合物太阳能电池的功率转换效率已超过18%。然而，大多数基于NFA的三元共混物是利用为聚合物-富勒烯系统开发的策略来构建的，在设计三元有机太阳能电池时，这些NFA的内在性质被忽视了。本文以一种新的2，2′-((4，4，9，9-tetrahexyl-4，9-dihydro-s-indaceno[1，2-b:5，6-b′]dithiophene-2，7-diyl)双(亚甲基亚甲基)双(1H-吲烯-1，3(2H)-二酮)为第三组分，将其引入PTQ10：PC61BM二元共混物中，观察到IDID的晶型出现，电池效率从3.38%显著提高到6.04%。这一相对增长(相对于最好的二元电池)接近80%，据我们所知，这是所有已报道的有机三元混合物中最高的。具体来说，IDID被发现是由主体聚合物给体PTQ10在加工溶剂的帮助下成核形成独特的多晶型，如掠入射X射线衍射(GIXRD)、差示扫描量热(DSC)所证明的，并得到了表面能测量的支持。更有趣的是，作为PTQ10：PC61BM系统的第三个组件，IDID的性能优于结构相似的NFA IDIC，后者仅将三元聚合物太阳能电池的效率从3.38%提高到3.55%。这项工作强调聚合物在非饱和脂肪酸中的多态是选择和优化三元有机太阳能电池组件的一个重要考虑因素。
Polymer solar cells, with the assistance of nonfullerene acceptors (NFAs) and ternary blend strategies, have exceeded 18% power conversion efficiency. However, most NFA-based ternary blends are constructed using the strategies developed for polymer–fullerene systems, and intrinsic properties of these NFAs have been overlooked when designing a ternary organic solar cell. Here, using a new NFA 2,2′-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl) bis(methaneylylidene)) bis(1H-indene-1,3(2H)-dione), referred to IDID, as the third component, we observed the appearance of a polymorph of IDID when it was introduced into a PTQ10: PC61BM binary blend and this ternary blend solar cell showed a significant improvement in efficiency from 3.38% to 6.04%. This relative increase (with respect to the best binary cell) is nearly 80% which is the highest among all the reported organic ternary blends to the best of our knowledge. Specifically, IDID was found to be nucleated by the host polymer donor PTQ10 under the assistance of the processing solvent to form a distinct polymorph, as proven by grazing incidence X-ray diffraction (GIXRD), differential scanning calorimetry (DSC), and supported by surface energy measurements. More interestingly, IDID, as a third component in the PTQ10: PC61BM system, was found to outperform the structurally similar NFA IDIC, which only boosted the efficiency from 3.38% to 3.55% in ternary polymer solar cells. This work highlights polymer-mediated polymorphism in NFAs as an important consideration in selection of components for and the optimization of ternary organic solar cells.