The study of influence of the gas flow rate to etched layer thickness, and roughness of the anisotropy field of gallium arsenide is etched in the plasma chemical etching process

In the experiments on the etched surface of gallium arsenide were performed. We studied the effect of BCl3 gas flow rate on the thickness of the etched layer. GaAs etching rate was: 537,4 nm/min 28,7 nm/min 2,6 nm/min, the values of the flow rate of BCl3 NBCl3 - 15, 10, 5 cc/min, respectively. The effect of BCl3 gas flow rate to the mean-square roughness of the etched surface. The influence of the anisotropy of the process on the geometry of the etched area. Revealed that the deflection angle for the samples treated with the working gas flow rate NBCl3 - 15 cc/min in the [110] direction was α [110]= 65,5° in direction [111] was α [111] = 45,58°. For samples treated with the working gas flow rate NBCl3 - 10 cc/min in the [110] direction was α [110] = 20,94° in direction [111] was α [111] = 11,37°. For samples treated with the working gas flow rate NBCl3 - 5 cc/min in the [110] was α [110] = 0,32° in direction [111] was α [111] = 0,21°. The results can be used to produce discrete diodes, heterojunction devices, and other results.

Source:IOPscience

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