Synthesis of two-dimensional single-crystal berzelianite nanosheets and nanoplates with near-infrared optical absorption
Synthesis of two-dimensional single-crystal berzelianite nanosheets and nanoplates with near-infrared optical absorption
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DOI：
10.1039/b907452j
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发表时间：
2009-01-01
影响因子：
--
通讯作者：
Muscat, Anthony J.
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文献类型：
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作者：
Deng, Zhengtao;Mansuripur, Masud;Muscat, Anthony J.
太阳能电池工业需要方便且廉价地制造半导体纳米结构作为具有低成本、环境友好、不含重金属（即，不含Hg、Cd和Pb）和接近1 eV的合适带隙特征。在本文中，我们展示了二维单晶berzelianite（Cu 2-xSe）纳米片（面内直径与厚度比接近100）和纳米片（面内直径与厚度比接近10）通过一个简单的，“绿色”和环境友好的方法注入到硒溶液中的石蜡液体。与先前的二元硫族化物纳米结构如CdSe的合成不同，当前的合成铍锌石的策略不使用昂贵且有毒的膦配体如三辛基膦（TOP）。通过X射线粉末衍射、扫描电子显微镜、X射线能谱、透射电子显微镜、选区电子衍射等手段对产物进行了表征，结果表明产物具有立方相结构和高质量的单晶二维纳米结构。UV-Vis-NIR吸收光谱表明，纳米片和纳米片分别在0.89 eV和0.80 eV处有明显的吸收起始，在1.70 eV和1.62 eV处有较强的光学吸收峰，覆盖了整个太阳光谱的红光区。本研究开辟了一条新的途径，“绿色”和低成本的可控合成的二元硫族化合物的技术应用在太阳能转换，也在广泛的光子器件工作在近红外。
The solar cell industry requires convenient and inexpensive fabrication of semiconductor nanostructures as highly efficient absorptive layers with low-cost, environmentally benign, heavy-metal-free (i.e., free from Hg, Cd, and Pb) and suitable band gap near 1 eV features. In this paper, we demonstrate the synthesis of two-dimensional single-crystal berzelianite (Cu2-xSe) nanosheets (in-plane diameter-to-thickness ratio similar to 100) and nanoplates (in-plane diameter-to-thickness ratio similar to 10) via a simple, "green" and environmentally benign method of injecting Cu(I)-complex precursor into Se-solution in paraffin liquid. Unlike the previous syntheses of binary chalcogenide nanostructures such as CdSe, the current strategy for berzelianite synthesis does not use expensive and toxic phosphine ligands such as trioctylphosphine (TOP). The products were characterized by a range of methods, such as X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and selected area electron diffraction, revealing that the products have the cubic phase and high-quality single-crystal two-dimensional nanostructure. UV-Vis-NIR absorption spectroscopy reveals that the nanosheets and nanoplates show obvious absorption onsets at 0.89 eV and 0.80 eV, respectively, and strong optical absorption peak at 1.70 eV and 1.62 eV, covering the whole red range of the solar spectrum. The present study opens a new avenue to "green" and low-cost controllable synthesis of binary chalcogenides with technological applications in solar energy conversion and also in a wide range of photonic devices operating in the near-infrared.