Coloration of SnSbO thin films
1991; Elsevier BV; Volume: 48-49; Linguagem: Inglês
10.1016/0169-4332(91)90307-6
ISSN1873-5584
AutoresY. Nakanishi, Y. Suzuki, Takato Nakamura, Yoshinori Hatanaka, Yasuo Fukuda, Akira Fujisawa, G. Shimaoka,
Tópico(s)Electronic and Structural Properties of Oxides
ResumoColoration of spray-pyrolysis-deposited thin films of SnSbO as a function of Sb content as well as changes in resistivity and structure have been investigated. It is well known that SnO2 films doped with a few % of Sb exhibit low resistivity and high optical transmittance. However, the resistivity of these films increases with increasing Sb content. Moreover, the films become darker with an additional bluish coloration with increasing Sb content up to [Sb][Sn]≈0.3, but this coloration is noticed to disappear at [Sb][Sn]> 1. To understand this phenomenon, the atomic ratio of the films and the oxidation states of the constituent elements were analyzed by XPS measurements. In the case of low-resistive and high-transmittance samples, the Sb3+ component, as compared to the Sb3+ component, is dominant in Sb 3d spectra. The Sb3+ component increases with increasing Sb content. It was found from X-ray diffraction measurements that the films consisted of SnO2 with partial [100] orientation at [Sb][Sn]⩽ 1, and were nearly amorphous at [Sb][Sn]⩾4. The degree of [100] orientation decreased with increasing [Sb][Sn]. It is concluded from these results that the darkening is due to optical scattering at the boundaries between SnO2 and Sb2Ox(x=3or5) micro-grains, and that the broad absorption is based on a charge transfer between Sb3+ and Sb5+.
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