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A Highly Crystalline Fused‐Ring n‐Type Small Molecule for Non‐Fullerene Acceptor Based Organic Solar Cells and Field‐Effect Transistors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-07-13 , DOI: 10.1002/adfm.201802895 Xin Song 1 , Nicola Gasparini 1 , Masrur Morshed Nahid 2 , Hu Chen 1 , Sky Marie Macphee 1 , Weimin Zhang 1 , Victoria Norman 3 , Chenhui Zhu 3 , Daniel Bryant 1 , Harald Ade 2 , Iain McCulloch 1, 4 , Derya Baran 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-07-13 , DOI: 10.1002/adfm.201802895 Xin Song 1 , Nicola Gasparini 1 , Masrur Morshed Nahid 2 , Hu Chen 1 , Sky Marie Macphee 1 , Weimin Zhang 1 , Victoria Norman 3 , Chenhui Zhu 3 , Daniel Bryant 1 , Harald Ade 2 , Iain McCulloch 1, 4 , Derya Baran 1
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N‐type organic small molecules (SMs) are attracting attention in the organic electronics field, due to their easy purification procedures with high yield. However, only a few reports show SMs that perform well in both organic field‐effect transistors (OFETs) and organic solar cells (OSCs). Here, the synthesis and characterization of an n‐type small molecule with an indacenodithieno[3,2‐b]thiophene (IDTT) core unit and linear alkylated side chain (C16) (IDTTIC) are reported. Compared to the state‐of‐the‐art n‐type molecule IDTIC, IDTTIC exhibits smaller optical bandgap and higher absorption coefficient, which is due to the enhanced intramolecular effect. After mixing with the polymer donor PBDB‐T, IDTIC‐based solar cells deliver a power conversion efficiency of only 5.67%. In stark contrast, the OSC performance of IDTTIC improves significantly to 11.2%. It is found that the superior photovoltaic properties of PBDB‐T:IDTTIC blends are mainly due to reduced trap‐assisted recombination and enhanced molecular packing coherence length and higher domain purity when compared to IDTIC. Moreover, a significantly higher electron mobility of 0.50 cm2 V−1 s−1 for IDTTIC in OFET devices than for IDTIC (0.15 cm2 V−1 s−1) is obtained. These superior performances in OSCs and OFETs demonstrate that SMs with extended π‐conjugation of the backbone possess a great potential for application in organic electronic devices.
中文翻译：
用于非富勒烯受体的有机太阳能电池和场效应晶体管的高结晶度融合环n型小分子
由于N型有机小分子（SM）易于纯化且产率高，因此在有机电子领域引起了关注。但是，只有少数报告显示SM在有机场效应晶体管（OFET）和有机太阳能电池（OSC）中均表现良好。在此，合成并表征了具有indacenodithieno [3,2-b]噻吩（IDTT）核心单元和线性烷基化侧链的n型小分子（C 16）（IDTTIC）。与最新的n型分子IDTIC相比，IDTTIC显示出较小的光学带隙和较高的吸收系数，这是由于分子内效应增强所致。与聚合物供体PBDB-T混合后，基于IDTIC的太阳能电池的功率转换效率仅为5.67％。与之形成鲜明对比的是，IDTTIC的OSC性能显着提高到11.2％。已发现，与IDTIC相比，PBDB-T：IDTTIC共混物的优异光伏性能主要归因于陷阱辅助重组的减少和分子堆积相干长度的增加以及域纯度的提高。此外，OFET器件中IDTTIC的电子迁移率显着高于IDTIC（0.15 cm的电子迁移率，为0.50 cm 2 V -1 s -1获得2 V -1 s -1）。这些在OSC和OFET中的优异性能表明，骨架扩展π共轭的SM具有在有机电子设备中应用的巨大潜力。
更新日期：2018-07-13
中文翻译：
用于非富勒烯受体的有机太阳能电池和场效应晶体管的高结晶度融合环n型小分子
由于N型有机小分子（SM）易于纯化且产率高，因此在有机电子领域引起了关注。但是，只有少数报告显示SM在有机场效应晶体管（OFET）和有机太阳能电池（OSC）中均表现良好。在此，合成并表征了具有indacenodithieno [3,2-b]噻吩（IDTT）核心单元和线性烷基化侧链的n型小分子（C 16）（IDTTIC）。与最新的n型分子IDTIC相比，IDTTIC显示出较小的光学带隙和较高的吸收系数，这是由于分子内效应增强所致。与聚合物供体PBDB-T混合后，基于IDTIC的太阳能电池的功率转换效率仅为5.67％。与之形成鲜明对比的是，IDTTIC的OSC性能显着提高到11.2％。已发现，与IDTIC相比，PBDB-T：IDTTIC共混物的优异光伏性能主要归因于陷阱辅助重组的减少和分子堆积相干长度的增加以及域纯度的提高。此外，OFET器件中IDTTIC的电子迁移率显着高于IDTIC（0.15 cm的电子迁移率，为0.50 cm 2 V -1 s -1获得2 V -1 s -1）。这些在OSC和OFET中的优异性能表明，骨架扩展π共轭的SM具有在有机电子设备中应用的巨大潜力。
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