射频等离子硫钝化GaAs（100）的表面特性

摘要

采用射频等离子方法,对GaAs(100)衬底片表面进行干法硫等离子体钝化,旨在得到性能稳定含硫钝化层。样品经过360℃温度条件下的快速热退火,光致发光( PL)测试表明,钝化后的样品PL强度上升了71%。同时,钝化样品的稳定性测试结果表明,样品放置在实验室空气中30 d,其PL强度未出现明显变化,说明GaAs的等离子体干法硫钝化具有较好的性能稳定性。%Sulfur-plasma process was proposed to clean and passivate the surface of (100) oriented GaAs wafers for stable sulfur passivation effect. The photoluminescence ( PL) intensity of processed samples with sulfur-plasma had an obvious improvement after 360 ℃ annealing, and 71% higher than the unpassivated sample. The stability of passivation was also tested. There was no obvious PL intensity degradation while the sample stored in open air over a month. The experiment results show that the passivation of GaAs surface treated by sulfur-plasma process has good stability.