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首页> 外文期刊>Advanced Functional Materials >Functionalized Graphene as an Electron-Cascade Acceptor for Air-Processed Organic Ternary Solar Cells
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Functionalized Graphene as an Electron-Cascade Acceptor for Air-Processed Organic Ternary Solar Cells

机译：功能化石墨烯作为空气级有机三元太阳能电池的电子级联受体

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摘要

Functionalized graphene nanoflakes (GNFs) are used as an electron-cascade acceptor material in air-processed organic ternary bulk heterojunction solar cells. The functionalization is realized via the attachment of the ethylenedinitrobenzoyl (EDNB) molecule to the GNFs. Simulation and experimental results show that such nanoscale modification greatly influences the density of states near the Fermi level. Consequently, the GNF-EDNB blend presents favorable highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels to function as a bridge structure between the poly[N-9-heptadecanyl-2,7-carbazole-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] (PCDTBT) and the [6,6]-phenyl-C71-butyric-acid-methyl-ester (PC71BM). The improved exciton dissociation and charge transport are associated with the better energy level alignment of the ternary blend and the high electrical conductivity of the GNFs, which act as additional electron transport channels within the photoactive layer. The resulting PCDTBT/GNF-EDNB/PC71BM ternary organic solar cells, fabricated entirely under ambient conditions, exhibit an average power conversion efficiency enhancement of approximate to 18% as compared with the binary blend PCDTBT/PC71BM.
机译：功能化的石墨烯纳米薄片（GNF）在空气处理的有机三元本体异质结太阳能电池中用作电子级联受体材料。通过将乙二硝基苯甲酰基（EDNB）分子连接到GNF上实现功能化。仿真和实验结果表明，这种纳米级修饰极大地影响了费米能级附近的态密度。因此，GNF-EDNB共混物呈现出有利的最高占据分子轨道和最低未占据分子轨道能级，以充当聚[N-9-十七烷基-2,7-咔唑-alt-5,5-（4）之间的桥结构，[7，di-2-thienyl-2，1，3-苯并噻二唑]]（PCDTBT）和[6，6]-苯基-C71-丁酸甲酯（PC71BM）。激子解离和电荷传输的改善与三元共混物更好的能级对准和GNF的高电导率有关，它们充当了光敏层内的附加电子传输通道。完全在环境条件下制造的所得PCDTBT / GNF-EDNB / PC71BM三元有机太阳能电池与二元共混物PCDTBT / PC71BM相比，平均功率转换效率提高了约18％。

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  • 来源
    《Advanced Functional Materials》 |2015年第25期|3870-3880|共11页
  • 作者

    Bonaccorso Francesco; Balis Nikolaos; Stylianakis Minas M.; Savarese Marika; Adamo Carlo; Gemmi Mauro; Pellegrini Vittorio; Stratakis Emmanuel; Kymakis Emmanuel;

  • 作者单位

    Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy;

    Technol Educ Inst TEI Crete, Ctr Mat Technol & Photon, GR-71004 Iraklion, Crete, Greece|Technol Educ Inst TEI Crete, Dept Elect Engn, GR-71004 Iraklion, Crete, Greece;

    Technol Educ Inst TEI Crete, Ctr Mat Technol & Photon, GR-71004 Iraklion, Crete, Greece|Technol Educ Inst TEI Crete, Dept Elect Engn, GR-71004 Iraklion, Crete, Greece;

    Ist Italiano Tecnol, CompuNet, I-16163 Genoa, Italy;

    Ist Italiano Tecnol, CompuNet, I-16163 Genoa, Italy|PSL Res Univ, Chim ParisTech, Inst Rech Chim Paris, CNRS, F-75005 Paris, France|Inst Univ France, F-75005 Paris, France;

    Ist Italiano Tecnol, Ctr Nanotechnol Innovat NEST, I-56127 Pisa, Italy;

    Ist Italiano Tecnol, Graphene Labs, I-16163 Genoa, Italy;

    Technol Educ Inst TEI Crete, Ctr Mat Technol & Photon, GR-71004 Iraklion, Crete, Greece|Technol Educ Inst TEI Crete, Dept Elect Engn, GR-71004 Iraklion, Crete, Greece|Fdn Res & Technol Hellas FORTH, IESL, Iraklion, Crete, Greece;

    Technol Educ Inst TEI Crete, Ctr Mat Technol & Photon, GR-71004 Iraklion, Crete, Greece|Technol Educ Inst TEI Crete, Dept Elect Engn, GR-71004 Iraklion, Crete, Greece;

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  • 关键词

    bulk heterojunctions; graphene; nanoflakes; organic photovoltaics; ternary blends;

    机译：本体异质结;石墨烯;纳米薄片;有机光伏;三元共混物;

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