Morphology Regulation by Upside-Down Thermal Annealing Based on Blend Thick-Film Organic Solar Cells,The Journal of Physical Chemistry C

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Morphology Regulation by Upside-Down Thermal Annealing Based on Blend Thick-Film Organic Solar Cells
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-06-16 , DOI: 10.1021/acs.jpcc.1c03994
Xiaohua Zhang ₁ , Pu Fan ₁ , Zijun Wang ₁ , Ding Zheng ₁ , Junsheng Yu ₁

Affiliation

The morphology property of the active layer which is determined by the post-treatment plays a critical role in optimizing the power conversion efficiency (PCE) of organic solar cells (OSCs). Here, we present a novel upside-down thermal annealing (DTA) method to regulate the morphology of PffBT4T-2OD:PC₇₁BM (poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3′′′-di(2-octyldodecyl)-2,2′;5′,2′′;5′′,2′′′-quaterthiophen-5,5′′′-diyl)]:6,6-phenyl C71 butyric acid methyl ester) and further increase the PCE. Compared with regular thermal annealing treatment, a dramatic 15% enhancement in PCE to 10.4% was obtained after the DTA process, which is attributed to the more orderly packed π–π stacking of the PffBT4T-2OD network and the redistribution of the PC₇₁BM molecules. Besides, the DTA method is beneficial for boosting the dissociation of excitons and transport of charge carriers. This ideal bulk-heterojunction (BHJ) morphology regulation by DTA based on thick-film OSCs is an effective way to achieve high-performance OSCs.

中文翻译：

基于混合厚膜有机太阳能电池的倒置热退火形态调节

由后处理决定的活性层的形态特性在优化有机太阳能电池 (OSC) 的功率转换效率 (PCE) 方面起着至关重要的作用。在这里，我们提出了一种新的倒置热退火 (DTA) 方法来调节 PffBT4T-2OD:PC ₇₁ BM (poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl )- alt -(3,3'''-di(2-octyldodecyl)-2,2';5',2'';5'',2'''-quaterthiophen-5,5'''-diyl )]:6,6-苯基 C71 丁酸甲酯) 并进一步提高 PCE。与常规热退火处理相比，DTA 工艺后 PCE 显着提高 15% 至 10.4%，这归因于 PffBT4T-2OD 网络的更有序堆积的 π-π 堆叠和 PC ₇₁的重新分布BM 分子。此外，DTA 方法有利于促进激子的解离和电荷载流子的传输。这种基于厚膜 OSC 的 DTA 理想体异质结 (BHJ) 形态调节是实现高性能 OSC 的有效方法。

更新日期：2021-07-22

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