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Effects of different types of unsymmetrical squaraines on the material properties and Coulomb interactions in organic photovoltaic devices†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-09-21 00:00:00 , DOI: 10.1039/c8qm00327k Lin Yang 1, 2, 3, 4, 5 , Daobin Yang 1, 2, 3, 4, 5 , Yao Chen 1, 2, 3, 4, 5 , Jianglin Wu 1, 2, 3, 4, 5 , Zhiyun Lu 1, 2, 3, 4, 5 , Hisahiro Sasabe 6, 7, 8, 9, 10 , Junji Kido 6, 7, 8, 9, 10 , Takeshi Sano 6, 7, 8, 9, 10 , Yan Huang 1, 2, 3, 4, 5
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-09-21 00:00:00 , DOI: 10.1039/c8qm00327k Lin Yang 1, 2, 3, 4, 5 , Daobin Yang 1, 2, 3, 4, 5 , Yao Chen 1, 2, 3, 4, 5 , Jianglin Wu 1, 2, 3, 4, 5 , Zhiyun Lu 1, 2, 3, 4, 5 , Hisahiro Sasabe 6, 7, 8, 9, 10 , Junji Kido 6, 7, 8, 9, 10 , Takeshi Sano 6, 7, 8, 9, 10 , Yan Huang 1, 2, 3, 4, 5
Affiliation
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Three unsymmetrical squaraine (USQ) dyes bearing different molecular skeletons were employed as donor materials in bulk-heterojunction (BHJ) organic photovoltaics (OPVs). The different molecular skeleton types of the USQs have an influence on their solid-state packing modes, optical properties, frontier orbital energy levels, carrier mobility and photovoltaic performance. More importantly, they also induce distinct differences in the strength of Coulomb interactions between the charge pairs in the USQ and fullerene phases. Through single crystal analysis, film morphology characterization and device architecture investigation with varying thicknesses of a bathocuproine (BCP) layer, it is found: firstly, the photovoltaic performances of the three USQ:PC71BM systems show different sensitivity to different BCP thickness, which can indirectly reflect that Coulomb attractions exist between the USQ phase and electrons in the PC71BM phase; secondly, a low electron mobility (1–2 × 10−4 cm2 V−1 s−1) in USQ : PC71BM (1 : 3) blend films may be attributed to the combination of well-mixed morphologies and strong Coulomb interactions; and thirdly, the USQ structures can affect the intensity of Coulomb attractions between the USQ phase and electrons in the PC71BM phase, and the influence can be large enough to not consider the morphology effect in some cases.
中文翻译：
不同类型的不对称方晶对有机光伏器件的材料性能和库仑相互作用的影响†
三种带有不同分子骨架的不对称方酸（USQ）染料被用作本体异质结（BHJ）有机光伏（OPV）中的供体材料。USQ的不同分子骨架类型会影响其固态堆积模式，光学性质，前沿轨道能级，载流子迁移率和光伏性能。更重要的是，它们还引起USQ和富勒烯相中电荷对之间库仑相互作用强度的明显差异。通过单晶分析，膜形貌表征和不同厚度的铜绿铜（BCP）层的器件结构研究，发现：首先，三个USQ：PC 71的光伏性能BM系统对不同的BCP厚度显示出不同的灵敏度，这可以间接反映出USQ相与PC 71 BM相中的电子之间存在库仑引力。其次，USQ：PC 71 BM（1：3）混合膜中的低电子迁移率（1-2×10 -4 cm 2 V -1 s -1）可能是由于形态混合良好和库仑力强的结合互动；第三，USQ结构会影响USQ相与PC 71 BM相中电子之间的库仑引力强度，而且这种影响可能很大，以致在某些情况下不考虑形态效应。
更新日期：2018-09-21
中文翻译：
不同类型的不对称方晶对有机光伏器件的材料性能和库仑相互作用的影响†
三种带有不同分子骨架的不对称方酸（USQ）染料被用作本体异质结（BHJ）有机光伏（OPV）中的供体材料。USQ的不同分子骨架类型会影响其固态堆积模式，光学性质，前沿轨道能级，载流子迁移率和光伏性能。更重要的是，它们还引起USQ和富勒烯相中电荷对之间库仑相互作用强度的明显差异。通过单晶分析，膜形貌表征和不同厚度的铜绿铜（BCP）层的器件结构研究，发现：首先，三个USQ：PC 71的光伏性能BM系统对不同的BCP厚度显示出不同的灵敏度，这可以间接反映出USQ相与PC 71 BM相中的电子之间存在库仑引力。其次，USQ：PC 71 BM（1：3）混合膜中的低电子迁移率（1-2×10 -4 cm 2 V -1 s -1）可能是由于形态混合良好和库仑力强的结合互动；第三，USQ结构会影响USQ相与PC 71 BM相中电子之间的库仑引力强度，而且这种影响可能很大，以致在某些情况下不考虑形态效应。
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