X-ray absorption near the edge structure and x-ray photoelectron spectroscopy studies on pyrite prepared by thermally sulfurizing iron films |
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Authors: | Zhang Hui Liu Ying-Shu Wang Bao-Yi Wei Long Kui Re-Xi and Qian Hai-Jie |
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Affiliation: | School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China; Multidisciplinary Research Center, Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | This paper reports how pyrite films were prepared by thermal
sulfurization of magnetron sputtered iron films and characterized by
x-ray absorption near edge structure spectra and x-ray photoelectron
spectroscopy on a 4B9B beam line at the Beijing Synchrotron Radiation
Facility. The band gap of the pyrite agrees well with the optical
band gap obtained by a spectrophotometer. The octahedral symmetry of
pyrite leads to the splitting of the d orbit into t_{\rm 2g} and
e_{\rm g} levels. The high spin and low spin states were analysed
through the difference of electron exchange interaction and the orbital
crystal field. Only when the crystal field splitting is higher than
1.5 eV, the two weak peaks above the white lines can appear, and this
was approved by experiments in the present work. |
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Keywords: | x-ray absorption near the edge
structure spectra x-ray photoelectron spectroscopy iron pyrite
films solar cells |
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