Solvothermal Synthesis of Zincblende and Wurtzite CuInS2 Nanocrystals and Their Photovoltaic Application

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• 作者：Wan-Chen Huang ; Chih-Hsiao Tseng ; Shu-Hao Chang ; Hsing-Yu Tuan ; Chien-Chih Chiang ; Lian-Ming Lyu ; Michael H. Huang
• 刊名：Langmuir
• 出版年：2012
• 出版时间：June 5, 2012
• 年：2012
• 卷：28
• 期：22
• 页码：8496-8501
• 全文大小：410K
• 年卷期：v.28,no.22(June 5, 2012)
• ISSN：1520-5827

文摘

We report a simple solvothermal synthesis approach to the growth of CuInS₂ nanocrystals with zincblende- and wurtzite-phase structures. Zincblende nanocrystals with particle sizes of 10鈥?0 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 CuInS₂ 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 CuInS₂ nanocrystals may be attractive precursors to light-absorbing materials for making efficient photovoltaic devices.