Energy Band Structure and Conducting Characteristics of ITO Films
Zhang Zhiguo(Institute of Functional Material,Quanzhou Normal University,Quanzhou 362000,China)
Using scanning electron micrographs and XRD analysis of ITO films,the energy band structures of equilibrium and non-equilibrium of ITO films are constructed.A model of the band-tail state distribution is built using the Kronig-Penney model.A never-before-reported hysteresis loop in the I-V curve is obtained in the measurement.The experimental results agree well with the theoretical data.By analyzing the mechanism behind the I-V characteristic,the model of the energy band structure is proved reasonable.The temperature characteristics of the ITO film measured show that the slope of the conductivity-temperature curve varies from a positive value to a negative one.
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