Regulation of the Miscibility of the Active Layer by Random Terpolymer Acceptors to Realize High-Performance All-Polymer Solar Cells,ACS Applied Polymer Materials

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Regulation of the Miscibility of the Active Layer by Random Terpolymer Acceptors to Realize High-Performance All-Polymer Solar Cells
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-03-22 , DOI: 10.1021/acsapm.1c00004
Dong Chen ₁ , Siqi Liu ₁ , Jinliang Liu ₁ , Jihui Han ₁ , Lie Chen ₁ , Yiwang Chen _{1,

2}

Affiliation

The main limitations on the power conversion efficiency (PCE) of all-polymer solar cells (all-PSCs) are the weak absorption coefficients of widely used naphthalene diimide (NDI)-based polymer acceptors and the difficulty of morphology control. Herein, a 3,3′-difluoro-2,2′-bithiophene (2FT) unit is introduced into the NDI-based polymer N2200 by random copolymerization, creating three terpolymer acceptors PNDI-2FT-0.1, PNDI-2FT-0.2, and PNDI-2FT-0.3. Incorporation of 2FT into the backbone is found to significantly improve the absorption coefficients of terpolymers. More importantly, it can be observed that random copolymerization of 2FT into the backbone not only can reduce the strong aggregation of the polymer but also can produce more flexible main chains to favor closer contact and better miscibility with the crystalline donor PBDB-T relative to the N2200 bipolymer. Under the optimal condition, a PBDB-T:PNDI-2FT-0.1-based device achieves a notable PCE of 9.46% with a short-circuit current (J_SC) of 16.62 mA cm^–2. Note that both the PCE and J_SC are the outstanding values in NDI-based all-PSCs. Moreover, the optimized morphology of a bulk heterojunction induced by random terpolymers enables an active layer that has good thickness tolerance. These results demonstrate that the simultaneous regulation of light absorption and miscibility between a donor and an acceptor by random copolymerization is a promising strategy to realize high-performance all-PSCs.

中文翻译：

通过无规三元共聚物受体调节活性层的可混溶性，以实现高性能的全聚合物太阳能电池

全聚合物太阳能电池（all-PSC）的功率转换效率（PCE）的主要限制是广泛使用的基于萘二酰亚胺（NDI）的聚合物受体的吸收系数较弱以及形态控制的难度。在此，通过无规共聚将3,3'-二氟-2,2'-联噻吩（2FT）单元引入NDI基聚合物N2200，从而生成三个三元共聚物受体PNDI-2FT-0.1，PNDI-2FT-0.2和PNDI-2FT-0.3。发现将2FT引入主链可以显着提高三元共聚物的吸收系数。更重要的是，可以观察到2FT在主链中的无规共聚不仅可以减少聚合物的强聚集，而且可以产生更柔韧的主链，从而与N2200二元共聚物相比，更易于与结晶供体PBDB-T接触，并具有更好的可混溶性。在最佳条件下，基于PBDB-T：PNDI-2FT-0.1的设备在短路电流下的PCE达到了显着的9.46％（J _SC）为16.62 mA cm ^–2。请注意，在基于NDI的所有PSC中，PCE和J _SC都是出色的值。此外，由无规三元共聚物诱导的本体异质结的最佳形态使活性层具有良好的厚度公差。这些结果表明，通过无规共聚同时调节供体和受体之间的光吸收和可混溶性是实现高性能全PSC的有前途的策略。

更新日期：2021-04-09

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