Calculation and Study on Elastic Constants and Electrical Properties of Sr Doped AgSnO2 Contact Materials with Different Concentrations

The elastic constants, energy band structure and state density of Sn1-xSrxO2 (x = 0, 0.0625, 0.0834, 0.125, 0.1667, 0.25) supercell system were calculated by the first-principles method, and the electron hole effective mass was calculated. The results reveal that the mechanical properties of material are better after Sr doping, and the band gap gradually decreases as the decreases of Sr doping concentration, the electron hole mobility increase, and the electron hole effective mass decreases. Finally, the electrical contact test results show that the average contact resistance is the smallest when the concentration of Sr doping is 6.25%, and it is 0.83 m Omega. And the SEM microstructure becomes denser when the concentration of Sr doping is 6.25%, the anti-welding performance of contact material is improved. Thus, the electrical properties of AgSnO2 contact material are better when the concentration of Sr doping is 6.25%