对采用射频等离子体分子束外延(RF-plasmaMBE)生长得到的GaN进行极性研究.由于镓极性(Ga-polar)比氮极性(N-polar)有更好的化学稳定性,通过比较RF-plasmaMBE生长得到的不同GaN样品对光辅助湿法刻蚀的稳定性,发现缓冲层生长条件对GaN外延层的极性有着重要影响:较高缓冲层生长温度得到的GaN外延层表现为N-polar,较低缓冲层生长温度得到的GaN外延层表现为Ga-polar.
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