Sequentially Deposited Elastomer-Based Ternary Active Layer for High-Performance Stretchable Organic Solar Cells,Advanced Functional Materials

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Sequentially Deposited Elastomer-Based Ternary Active Layer for High-Performance Stretchable Organic Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-02-06 , DOI: 10.1002/adfm.202312289
Weibing Tang ₁ , Zicheng Ding ₁ , Yueling Su ₁ , Qiang Weng ₁ , Yi Zhang ₁ , Ruipeng Li ₂ , Wenliang Huang ₁ , Zhichao Wang ₁ , Yin Wu ₁ , Yanchun Han ₃ , Kui Zhao ₁ , Zhou Yang ₁ , Xiaochen Wang ₄ , Shengzhong (Frank) Liu ₁

Affiliation

Stretchable organic solar cells (OSCs) with high power conversion efficiency and good mechanical deformation are promising as power sources for wearable electronics. However, synergistic improvement of both photovoltaic efficiency and mechanical ductility is challenging for state-of-the-art polymer donor: non-fullerene acceptor (NFA)-based photovoltaic active layers. Here, a high-performance stretchable OSC with a power conversion efficiency of 16.54% and a crack-onset strain of 26.38% by synergetic optimization film microstructure of sequentially deposited ternary active layer consisting of a polymer donor poly[2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-5,5'-(5,8-bis(4-(2-butyloctyl)thiophen-2-yl)dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole)] (D18), an NFA 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene)bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalonitrile) (Y6), and an elastomer polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) is reported. Adding a low-content solvent additive para-xylene into main solvent carbon disulfide induces high-density fibers networks with low crystallinity in bottom D18 layer, and this further suppresses the large phase separation between Y6 and SEBS in top layer. Moreover, incorporating a solid additive 1,3-dibromo-5-chlorobenzene with better compatibility with Y6 can promote Y6 dispersions to form smaller ordered domains in SEBS matrix. Finally, the optimal ternary active layer shows significantly higher efficiency and stretchability, resulting in a large efficiency-stretchability factor of 4.36%, which is among the best values for stretchable OSCs.

中文翻译：

用于高性能可拉伸有机太阳能电池的顺序沉积的基于弹性体的三元活性层

具有高能量转换效率和良好机械变形的可拉伸有机太阳能电池（OSC）有望作为可穿戴电子产品的电源。然而，光伏效率和机械延展性的协同提高对于最先进的聚合物供体：基于非富勒烯受体（NFA）的光伏活性层来说是一个挑战。在此，通过协同优化顺序沉积的由聚合物供体聚[2,6-(4, 8-双(5-(2-乙基己基-3-氟)噻吩-2-基)-苯并[1,2-b:4,5-b']二噻吩))-alt-5,5'-(5 ,8-双(4-(2-丁基辛基)噻吩-2-基)二噻吩并[3',2':3,4;2'',3'':5,6]苯并[1,2-c] [1,2,5]噻二唑)] (D18)，一种 NFA 2,2'-((2Z,2'Z)-((12,13-双(2-乙基己基)-3,9-二十一烷基-12 ,13-二氢-[1,2,5]噻二唑并[3,4-e]噻吩并[2'',3'':4',5']噻吩并[2',3':4,5]吡咯[ 3,2-g]噻吩并[2',3':4,5]噻吩并[3,2-b]吲哚-2,10-二基)双(亚甲基)双(5,6-二氟-3-氧代-报道了2,3-二氢-1H-茚-2,1-二亚基))二丙二腈)(Y6)和弹性体聚苯乙烯-嵌段-聚(乙烯-无规-丁烯)-嵌段-聚苯乙烯(SEBS)。在主溶剂二硫化碳中添加低含量溶剂添加剂对二甲苯，在底层D18层中诱导出低结晶度的高密度纤维网络，这进一步抑制了顶层中Y6和SEBS之间的大相分离。此外，掺入与Y6具有更好相容性的固体添加剂1,3-二溴-5-氯苯可以促进Y6分散体在SEBS基体中形成更小的有序域。最后，最佳三元活性层表现出显着更高的效率和可拉伸性，导致效率-可拉伸性系数高达 4.36%，这是可拉伸 OSC 的最佳值之一。

更新日期：2024-02-06

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