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Quaternary Cu2ZnSnS4 quantum dot-sensitized solar cells: Synthesis, passivation and ligand exchange

机译:季Cu2ZnSnS4量子点敏化太阳能电池:合成,钝化和配体交换

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摘要

The quaternary Cu2ZnSnS4 (CZTS) QDs had been successfully introduced into quantum dot-sensitized solar cells (QDSC) via hydrolysis approach in our previous work [Green Chem. 2015, vol. 17, p. 4377], but the obtained cell efficiency was still limited by low open-circuit voltage and fill factor. Herein, we use 1-dodecanethiol (DDT) as capping ligand for fairly small-sized CZTS QDs synthesis to improve their intrinsic properties. Since this strong bonded capping ligand can not be replaced by 3-mercaptopropionic acid (MPA) directly, the nature cation (Cu, Zn or Sn)-DDT units of QDs are first exchanged by the pre-conjugated Cd-oleate via successive ionic layer adsorption and reaction (SILAR) procedure accompanied with the formation of a core/shell structure. The weak bonded oleic acid (OA) can be finally replaced by MPA and the constructed water soluble CZTS/CdSe QDSC achieves an impressive conversion efficiency of 4.70%. The electron transport and recombination dynamic processes are confirmed by intensity modulated photocurrent spectroscopy (IMPS)/intensity-modulated photovoltage spectroscopy (IMVS) measurements. It is found that the removal of long alkyl chain is conducive to improve the electron transport process and the type-II core/shell structure is beneficial to accelerate electron transport and retard charge recombination. This effective ligand removal strategy is proved to be more convenient for the applying of quaternary QDs in QDSC and would boost a more powerful efficiency in the future work. (C) 2016 Elsevier B.V. All rights reserved.
机译:在我们以前的工作中,通过水解方法已将四级Cu2ZnSnS4(CZTS)QD成功地引入了量子点敏化太阳能电池(QDSC)[Green Chem。 2015年17页。 [4377],但是所获得的电池效率仍然受到低开路电压和填充因子的限制。在本文中,我们使用1-十二烷硫醇(DDT)作为封端配体,用于相当小的CZTS QD合成,以改善其固有特性。由于这种牢固的键合封端配体不能直接被3-巯基丙酸(MPA)取代,因此QD的天然阳离子(Cu,Zn或Sn)-DDT单元首先通过预共轭的Cd-油酸酯通过连续的离子层进行交换吸附和反应(SILAR)程序,伴随着核/壳结构的形成。最终可以用MPA代替弱结合的油酸(OA),并且所构建的水溶性CZTS / CdSe QDSC可实现4.70%的惊人转换效率。电子传输和复合动力学过程通过强度调制光电流能谱(IMPS)/强度调制光电压能谱(IMVS)的测量得到证实。发现长烷基链的去除有利于改善电子传输过程,并且II型核/壳结构有利于加速电子传输和延迟电荷复合。事实证明,这种有效的配体去除策略对于在QDSC中应用四级QD更方便,并且在将来的工作中将提高效率。 (C)2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of power sources》 |2016年第30期|35-40|共6页
  • 作者单位

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

    Henan Univ, Collaborat Innovat Ctr Nano Funct Mat & Applicat, Key Lab Special Funct Mat, MOE, Kaifeng 475004, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cu2ZnSnS4; Cation exchange; Core-shell; Quantum dot-sensitized solar cells; Charge transport;

    机译:Cu2ZnSnS4;阳离子交换;核壳;量子点敏化太阳能电池;电荷输运;
  • 入库时间 2022-08-18 00:22:19

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