中国物理B ›› 2011, Vol. 20 ›› Issue (4): 47802-047802.doi: 10.1088/1674-1056/20/4/047802

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Ellipsometric analysis and optical absorption characterization of gallium phosphide nanoparticulate thin film

魏文生1, 章启贤2, 阮方平2   

  1. (1)Mathematics Group, Wuwei No. 1 Middle School of Anhui Province, Wuwei 238300, China; (2)Physics Group, Wuwei No. 1 Middle School of Anhui Province, Wuwei 238300, China
  • 收稿日期:2010-09-23 修回日期:2010-11-10 出版日期:2011-04-15 发布日期:2011-04-15

Ellipsometric analysis and optical absorption characterization of gallium phosphide nanoparticulate thin film

Zhang Qi-Xian(章启贤)a)†, Wei Wen-Sheng(魏文生)b), and Ruan Fang-Ping(阮方平) a)   

  1. a Physics Group, Wuwei No. 1 Middle School of Anhui Province, Wuwei 238300, China; b Mathematics Group, Wuwei No. 1 Middle School of Anhui Province, Wuwei 238300, China
  • Received:2010-09-23 Revised:2010-11-10 Online:2011-04-15 Published:2011-04-15

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摘要： Gallium phosphide (GaP) nanoparticulate thin films were easily fabricated by colloidal suspension deposition via GaP nanoparticles dispersed in N,N-dimethylformamide. The microstructure of the film was performed by x-ray diffraction, high resolution transmission electron microscopy and field emission scanning electron microscopy. The film was further investigated by spectroscopic ellipsometry. After the model GaP+void|SiO2 was built and an effective medium approximation was adopted, the values of the refractive index n and the extinction coefficient k were calculated for the energy range of 0.75 eV-4.0 eV using the dispersion formula in DeltaPsi2 software. The absorption coefficient of the film was calculated from its k and its energy gaps were further estimated according to the Tauc equation, which were further verified by its fluorescence spectrum measurement. The structure and optical absorption properties of the nanoparticulate films are promising for their potential applications in hybrid solar cells.

关键词: ellipsometry, optical energy gaps, gallium phosphide, particulate thin film

Abstract: Gallium phosphide (GaP) nanoparticulate thin films were easily fabricated by colloidal suspension deposition via GaP nanoparticles dispersed in N,N-dimethylformamide. The microstructure of the film was performed by x-ray diffraction, high resolution transmission electron microscopy and field emission scanning electron microscopy. The film was further investigated by spectroscopic ellipsometry. After the model GaP+void|SiO2 was built and an effective medium approximation was adopted, the values of the refractive index n and the extinction coefficient k were calculated for the energy range of 0.75 eV–4.0 eV using the dispersion formula in DeltaPsi2 software. The absorption coefficient of the film was calculated from its k and its energy gaps were further estimated according to the Tauc equation, which were further verified by its fluorescence spectrum measurement. The structure and optical absorption properties of the nanoparticulate films are promising for their potential applications in hybrid solar cells.

Key words: ellipsometry, optical energy gaps, gallium phosphide, particulate thin film

中图分类号:  (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

  • 78.67.-n
78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters) 78.20.-e (Optical properties of bulk materials and thin films) 07.60.Fs (Polarimeters and ellipsometers)