Reducible‐Shell‐Derived Pure‐Copper‐Nanowire Network and Its Application to Transparent Conducting Electrodes
Reducible‐Shell‐Derived Pure‐Copper‐Nanowire Network and Its Application to Transparent Conducting Electrodes
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DOI：
10.1002/adfm.201602094
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发表时间：
2016-09
影响因子：
19
通讯作者：
Hyewon Hwang;A. Kim;Zhaoyang Zhong;H. Kwon;Sunho Jeong;Jooho Moon
中科院分区：
文献类型：
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作者：
Hyewon Hwang;A. Kim;Zhaoyang Zhong;H. Kwon;Sunho Jeong;Jooho Moon
提出了使用由可还原的易挥发材料保形包裹的芯铜纳米线（CuNW）用于具有高氧化稳定性的透明导电电极（TCE）的概念。通过酸与表面氧化物和氢氧化物的化学反应，在将乳酸添加到CuNW分散体中时，在每个CuNW上容易地获得均匀的表面壳层。乳酸铜壳防止核心CuNW在储存和成膜期间氧化，使得核心Cu纳米线能够保持其特征光电性质。通过在氮气气氛下的简单热退火，乳酸铜壳很容易分解以暴露下面的纯铜，从而提供了一种有效的方法来生产纯CuNW网络TCE，其薄层电阻为19.8 Ω sq−1，在550 nm处的光学透射率为85.5%。首次进一步证明了将CuNW基TCE应用于有机金属卤化物钙钛矿太阳能电池中的透明顶部电极，与具有氧化铟锡电极的常规钙钛矿太阳能电池的13.39%相比，产生了9.88%的功率转换效率。这项研究提出了这些CuNW作为钙钛矿太阳能电池中的无真空和无贵金属透明窗口电极的高度可行性。
The concept of using core Cu nanowires (CuNWs) that are conformally encapsulated by a reducible fugitive material for transparent conducting electrodes (TCEs) with high oxidation stability is presented. By the chemical reaction of an acid with surface oxide and hydroxide, a uniform surface shell layer is readily obtained on each CuNW upon adding lactic acid to the CuNW dispersion. The Cu lactate shell prevents the core CuNW from oxidizing during storage and film formation, enabling the core Cu nanowires to maintain their characteristic optoelectronic properties. Through simple thermal annealing under a nitrogen atmosphere, the Cu lactate shell is easily decomposed to expose the underlying pure Cu, providing an effective way to produce a pure‐CuNW‐network TCE with a sheet resistance of 19.8 Ω sq−1 and an optical transmittance of 85.5% at 550 nm. The application of the CuNW‐based TCE to the transparent top electrode in organometallic halide perovskite solar cells is further demonstrated for the first time, yielding a power‐conversion efficiency 9.88% as compared to that of 13.39% for conventional perovskite solar cells with an indium–tin‐oxide electrode. This study proposes the high feasibility of these CuNWs as a vacuum‐free and noble‐metal‐free transparent‐window electrode in perovskite solar cells.