The Study of the Optical Properties of Conducting Tin Oxide Films and their Interpretation in Terms of a Tentative Band Scheme
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概要
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The present report is concerned with an experimental investigation of the influence of free carriers on the optical absorption of SnO_2, which is an almost perfect insulator in its stoichiometric composition but can be endowed with a semi-metallic conductivity when synthesized by the spraying method. In order to investigate the problem quantitatively, the intrinsic absorption edges of non-conducting films of SO_2, SnO, PbO_2 and TiO_2, as well as that of the conducting tin oxide film (Nesa), were measured at room and liquid nitrogen temperatures. The systematic shift of the edge with the variation of the lattice constants of these oxides was confirmed experimentally with the exception of Nesa, in which case the edge was always found ca. 0.1eV higher in energy than that of the non-conducting SnO_2 film. This latter phenomenon was interpreted as the filling-up effect of the bottom of the conduction band by the free carriers, in accordance with the theory of Fan et al presented for the case of InSb. With the aid of the other auxiliary electrical and thermal experiments performed, a tentative energy band scheme of the conducting tin oxide was proposed.
- 社団法人日本物理学会の論文
- 1960-05-05
著者
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Arai Toshihiro
Institte For Optical Research Kyoiku University
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Arai Toshihiro
Institute Of Physics College Of General Education University Of Tokyo:(present)electrical Communicat
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