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The model of gradient-distributed oxygen vacancies is utilized in simulating the grain size effects of gas-sensitive SnO2 thin films. The distribution profile of oxygen vacancies has a grain size effect and the profile gradient correlates positively with the radius of the grains. The simulation results show that the grain size is a fundamental factor dominating the gas-sensing properties of thin films...
The grain size effects on tin oxide gas-sensitive elements are numerically described by the model of gradient-distributed oxygen vacancies, which extends the receptor function of semiconductors to the condition of inhomogeneous donor density in grains. The sensor resistance and the response to the reducing gas are formulated as functions of the grain size and the depletion layer width. The simulations...
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