High Miscibility Compatible with Ordered Molecular Packing Enables an Excellent Efficiency of 16.2% in All-Small-Molecule Organic Solar Cells,Advanced Materials

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High Miscibility Compatible with Ordered Molecular Packing Enables an Excellent Efficiency of 16.2% in All-Small-Molecule Organic Solar Cells
Advanced Materials ( IF 27.4 ) Pub Date : 2021-11-13 , DOI: 10.1002/adma.202106316
Lili Zhang _{1,

2} , Xiangwei Zhu ₁ , Dan Deng ₁ , Zhen Wang ₃ , Ziqi Zhang ₁ , Yi Li ₁ , Jianqi Zhang ₁ , Kun Lv ₁ , Lixuan Liu ₁ , Xuning Zhang ₁ , Huiqiong Zhou ₁ , Harald Ade ₃ , Zhixiang Wei ₁

Affiliation

In all-small-molecule organic solar cells (ASM-OSCs), a high short-circuit current (J_sc) usually needs a small phase separation, while a high fill factor (FF) is generally realized in a highly ordered packing system. However, small domain and ordered packing always conflicted each other in ASM-OSCs, leading to a mutually restricted J_sc and FF. In this study, alleviation of the previous dilemma by the strategy of obtaining simultaneous good miscibility and ordered packing through modulating homo- and heteromolecular interactions is proposed. By moving the alkyl-thiolation side chains from the para- to the meta-position in the small-molecule donor, the surface tension and molecular planarity are synchronously enhanced, resulting in compatible properties of good miscibility with acceptor BTP-eC9 and strong self-assembly ability. As a result, an optimized morphology with multi-length-scale domains and highly ordered packing is realized. The device exhibits a long carrier lifetime (39.8 μs) and fast charge collection (15.5 ns). A record efficiency of 16.2% with a high FF of 75.6% and a J_sc of 25.4 mA cm⁻² in the ASM-OSCs is obtained. These results demonstrate that the strategy of simultaneously obtaining good miscibility with high crystallinity could be an efficient photovoltaic material design principle for high-performance ASM-OSCs.

中文翻译：

与有序分子堆积相容的高混溶性使全小分子有机太阳能电池的效率达到 16.2%

在全小分子有机太阳能电池（ASM-OSCs）中，高短路电流（J _sc）通常需要小的相分离，而高填充因子（FF）通常在高度有序的包装系统中实现。然而，在 ASM-OSC 中，小域和有序打包总是相互冲突，导致J _sc和 FF 相互限制。在这项研究中，提出了通过调节同分子和异分子相互作用同时获得良好混溶性和有序堆积的策略来缓解先前的困境。通过将烷基硫醇化侧链从对位移动到间位在小分子供体-位置，表面张力和分子平面度同步增强，与受体BTP-eC9相容性好，自组装能力强。结果，实现了具有多长度尺度域和高度有序堆积的优化形态。该器件具有长载流子寿命 (39.8 μs) 和快速电荷收集 (15.5 ns)。在 ASM-OSC 中获得了 16.2% 的创纪录效率和 75.6% 的高 FF 和25.4 mA cm ^-2的J _{sc 。}这些结果表明，同时获得良好的混溶性和高结晶度的策略可能是高性能 ASM-OSC 的有效光伏材料设计原则。

更新日期：2021-11-13

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