Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.
Langmuir. 2012 Jun 5;28(22):8496-501. doi: 10.1021/la300742p. Epub 2012 May 18.
We report a simple solvothermal synthesis approach to the growth of CuInS(2) nanocrystals with zincblende- and wurtzite-phase structures. Zincblende nanocrystals with particle sizes of 10-20 nm were produced using oleylamine as the solvent. When ethylenediamine was used as the solvent, similarly sized wurtzite nanocrystals with some degree of particle aggregation were formed. Use of a mixture of these solvents gave products with mixed phases including some polyhedral nanostructures. The crystal phases of these nanocrystals were carefully determined by X-ray diffraction and transmission electron microscopy analysis. All the samples exhibit strong absorption from the entire visible light region to the near-infrared region beyond 1300 nm. Pure-phase zincblende and wurtzite CuInS(2) nanocrystals were employed as ink in the fabrication of solar cells. The spray-coated nanocrystal layer was subjected to a selenization process. A power conversion efficiency of ~0.74% and a good external quantum efficiency profile over broad wavelengths have been measured. The results demonstrate that wurtzite and zincblende CuInS(2) nanocrystals may be attractive precursors to light-absorbing materials for making efficient photovoltaic devices.
我们报告了一种简单的溶剂热合成方法，用于生长具有闪锌矿和纤锌矿结构的 CuInS(2)纳米晶体。使用油胺作为溶剂可以制备出粒径为 10-20nm 的闪锌矿纳米晶体。而当使用乙二胺作为溶剂时，则会形成具有一定程度颗粒聚集的相似尺寸的纤锌矿纳米晶体。使用这些溶剂的混合物可以得到具有混合相的产物，包括一些多面体纳米结构。通过 X 射线衍射和透射电子显微镜分析，仔细确定了这些纳米晶体的晶体相。所有样品都表现出从整个可见光区域到 1300nm 以上近红外区域的强烈吸收。纯相闪锌矿和纤锌矿 CuInS(2)纳米晶体被用作太阳能电池制造中的墨水。喷雾涂覆的纳米晶体层经过硒化处理。已测量到约 0.74%的功率转换效率和在宽波长范围内良好的外量子效率分布。结果表明，纤锌矿和闪锌矿 CuInS(2)纳米晶体可能是用于制造高效光伏器件的光吸收材料的有吸引力的前体。
