Wang Tong, Niu Meng-Si, Wen Zhen-Chuan, Jiang Zhi-Nan, Qin Chao-Chao, Wang Xiang-Yang, Liu He-Yuan, Li Xi-You, Yin Hang, Liu Jian-Qiang, Hao Xiao-Tao
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong 250100, P. R. China.
School of Physics, Henan Normal University, Xinxiang, Henan 453007, P. R. China.
ACS Appl Mater Interfaces. 2021 Mar 10;13(9):11134-11143. doi: 10.1021/acsami.0c22452. Epub 2021 Feb 24.
Achieving high-efficiency thick-film bulk heterojunction (BHJ) organic solar cells (OSCs) with thickness-independent power conversion efficiencies (PCEs) in a wide thickness range is still a challenge for the roll-to-roll printing techniques. The concept of diluting the transport sites within BHJ films with insulating polymers can effectively eliminate charge trapping states and optimize the charge transport. Herein, we first adopted the concept with insulating polypropylene (PP) in the efficient non-fullerene system (PM6:Y6) and demonstrated its potential to fabricate thick-film OSCs. The PP can form an insulating matrix prior to PM6 and Y6 within the BHJ film, resulting in an enhanced molecular interaction and isolated charge transport by expelling Y6 molecules. We thus observed reduced trap state density and improved charge transport properties in the PP-blended device. At around 300 nm, the PM6:Y6:PP device enjoys a high PCE of 15.5% and achieves over 100% of the efficiency of the optimal thin-film device, which is significantly improved compared to the binary PM6:Y6 counterpart. This research promotes an effective strategy with insulating polymers and provides knowledge of commercial production with response to the roll-to-roll technique demands.
对于卷对卷印刷技术而言，在宽厚度范围内实现具有与厚度无关的功率转换效率（PCE）的高效厚膜体异质结（BHJ）有机太阳能电池（OSC）仍然是一项挑战。用绝缘聚合物稀释BHJ薄膜内的传输位点这一概念可以有效消除电荷俘获态并优化电荷传输。在此，我们首次在高效非富勒烯体系（PM6:Y6）中采用了绝缘聚丙烯（PP）这一概念，并展示了其制造厚膜OSC的潜力。PP可在BHJ薄膜内先于PM6和Y6形成绝缘基质，通过排出Y6分子增强分子间相互作用并隔离电荷传输。因此，我们观察到在PP共混器件中陷阱态密度降低且电荷传输性能得到改善。在约300 nm时，PM6:Y6:PP器件具有15.5%的高PCE，实现了最佳薄膜器件效率的100%以上，与二元PM6:Y6对应物相比有显著提高。本研究推广了一种使用绝缘聚合物的有效策略，并为响应卷对卷技术需求的商业生产提供了知识。
