Synthesis and thermal annealing treatment of octylphosphonic acid-capped CdSe-tetrapod nanocrystals for bulk hetero-junction solar cell applications

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• 作者：Nguyen Tam Nguyen Truong (1)
  Kieu Thanh Trinh (1)
  Viet Thanh Hau Pham (1)
  Chang Duk Kim (1)
  Chinho Park (1)
  
  1. School of Chemical Engineering ; Yeungnam University ; 280 ; Daehak-ro ; Gyeongsan ; 712-749 ; Korea
  
• 关键词：Photoluminescence ; Absorption ; Red ; shift ; Surface Roughness ; CdSe ; Bulk Hetero ; junction Solar Cells
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：32
• 期：4
• 页码：761-766
• 全文大小：1,565 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

CdSe-tetrapod nanocrystals (NCs) were synthesized by using octylphosphonic acid (OPA) as a capping ligand and cadmium oxide (CdO) as a cadmium precursor. The effects of thermal annealing in nitrogen (N2) environment on the chemical composition, morphology, crystal structure and optoelectronic properties of the CdSe-tetrapods have been investigated. Remarkable difference in the morphological and optoelectronic properties between as-synthesized and N2-annealed CdSe NCs was observed. The photoluminescence (PL) peak of N2-annealed CdSe NCs shifted to lower energy and UV-vis absorption spectra shifted to longer wavelength, indicating the size increase and improvement of the crystallinity of the CdSe tetrapods. The power conversion efficiency of bulk hetero-junction solar cells made with the annealed CdSe NCs showed higher value compared with the efficiency of cells made with as-synthesized CdSe NCs.