Case Study on the Correlation between Crystal Packing and Miscibility of Chlorinated Thiophene–Based Donor Polymers for Nonfullerene Organic Solar Cells with Long Shelf Life,Solar RRL

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Case Study on the Correlation between Crystal Packing and Miscibility of Chlorinated Thiophene–Based Donor Polymers for Nonfullerene Organic Solar Cells with Long Shelf Life
Solar RRL ( IF 6.0 ) Pub Date : 2020-05-13 , DOI: 10.1002/solr.202000074
Sung Jae Jeon ₁ , Yong Woon Han ₁ , Young Hoon Kim ₁ , Doo Kyung Moon ₁

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Nonfullerene organic solar cells (NFOSCs) have proven to have greater potential in terms of efficiency than fullerene‐based OSCs. However, the heterogeneity of nonfullerene acceptors (NFAs)‐based blend morphology is complex, making it difficult to understand, especially as its optimization requires that compatibility among the molecules be considered. Herein, P(Cl)(F = 0.5) is newly synthesized with a type of terpolymer to increase compatibility with NFAs relative to that of conventional polymers. As a result, the combination of P(Cl)(F = 0.5) with IDIC increases its power conversion efficiency (PCE) to 12.1%, compared with that of P(Cl):ITIC‐Th and P(F‐Cl):IT‐4F. However, during the shelf life stability of optimized devices without encapsulation, a rapid decrease in the efficiency of P(Cl)(F = 0.5):IDIC and P(F‐Cl):IT‐4F is observed; the PCEs of P(Cl) (F = 0.5):IDIC and P(F‐Cl):IT‐4F decrease to 24.1% and 43.5% of their initial values for up to 350 and 398 h, respectively. On the contrary, P(Cl):ITIC‐Th exhibits superior longterm air stability with a PCE decrease of −2% (for 317‐h) and 9% (for 2002‐h) compared with the initial PCE. To understand this phenomenon, the correlation between crystallinity and miscibility of blend films is systematically investigated. In short, the balanced crystallinity and miscibility of donor and acceptor induces a relatively more stable morphology.

中文翻译：

具有长保质期的非富勒烯有机太阳能电池的晶体填充与氯化噻吩基供体聚合物混溶性相关的案例研究

与基于富勒烯的OSC相比，非富勒烯有机太阳能电池（NFOSC）具有更高的效率潜力。但是，基于非富勒烯受体（NFA）的共混物形态的异质性很复杂，很难理解，特别是因为其优化需要考虑分子之间的相容性。这里，P（Cl）（F ＝ 0.5）是用一种三元共聚物新合成的，以相对于常规聚合物增加与NFA的相容性。结果，P（Cl）（F = 0.5），与P（Cl）：ITIC-Th和P（F-Cl）：IT-4F相比，IDIC的功率转换效率（PCE）提高到12.1％。但是，在没有封装的优化设备的货架期稳定性中，观察到P（Cl）（F = 0.5）：IDIC和P（F-Cl）：IT-4F的效率迅速下降；P（Cl）（F = 0.5）：IDIC和P（F-Cl）：IT-4F分别在长达350和398小时的时间内下降到其初始值的24.1％和43.5％。相反，P（Cl）：ITIC-Th具有优异的长期空气稳定性，与初始PCE相比，PCE降低了−2％（317-h）和9％（2002-h）。为了理解该现象，系统地研究了共混膜的结晶度和混溶性之间的相关性。简而言之，供体和受体的平衡结晶度和可混溶性引起相对更稳定的形态。

更新日期：2020-05-13

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