Highly Conductive Copper Selenide Nanocrystal Thin Films for Advanced Electronics
Highly Conductive Copper Selenide Nanocrystal Thin Films for Advanced Electronics
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DOI：
10.1021/acsaelm.9b00323
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发表时间：
2019-07
影响因子：
4.7
通讯作者：
M. Samadi Khoshkhoo;Josephine F. L. Lox;A. Koitzsch;Hans Lesny;Y. Joseph;V. Lesnyak;A. Eychmüller
中科院分区：
文献类型：
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作者：
M. Samadi Khoshkhoo;Josephine F. L. Lox;A. Koitzsch;Hans Lesny;Y. Joseph;V. Lesnyak;A. Eychmüller
研究纳米晶（NC）表面化学对纳米基薄膜光电性能的影响对其在各种器件中的进一步应用具有重要意义。在这项工作中，通过在液/气界面自组装制备了薄膜形式的硒化铜（Cu2-xSe） NCs的宏观超晶格，同时与无机S2 -以及有机1,2-乙二硫醇、1,4-丁二硫醇、1,6-己二硫醇和1,8-辛二硫醇配体进行配体交换。通过x射线光电子能谱和光学吸收光谱分析，我们发现新引入的配体在很大程度上取代了Cu2-xSe NC表面的天然表面活性剂，并在相邻粒子之间起交联剂的作用。传输测量，特别是关注粒子间距离，表明随着配体尺寸的减小，从辛二硫醇到无机硫化物离子的电导率增加了5-9个数量级。
Investigation of the influence of the nanocrystal (NC) surface chemistry on the (opto)electronic properties of NC-based thin films is of paramount importance for their further application in various devices. In this work, macroscopic superlattices of copper selenide (Cu2–xSe) NCs in the form of thin films were prepared by self-assembly at the liquid/air interface accompanied by simultaneous ligand exchange with the inorganic S2– as well as organic 1,2-ethanedithiol, 1,4-butanedithiol, 1,6-hexanedithiol, and 1,8-octanedithiol ligands. By using X-ray photoelectron spectroscopy and optical absorption spectroscopy, we revealed that the newly introduced ligands largely replaced the native surfactants on the Cu2–xSe NC surface and acted as cross-linkers between neighboring particles. Transport measurements, specifically focusing on the interparticle distance, indicated 5–9 orders of magnitude increase in electrical conductance with decreasing the size of the ligands from octanedithiol to inorganic sulfide ions,...