Epitaxy: Concerns/ constraints- lattice-matched systems; strained layers( pseudomorphic)- limits of thickness; impact of strain on bands, properties.

磊晶：关键与限制-晶格匹配之材料系统；应变层（晶）-厚度上限；应力对能带的影响，特性。

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Because the atomic lattice structure of gallium nitride is better matched to sapphire than it is to silicon, making LEDs on silicon without distortions has proved extremely tricky.

ECONOMIST: Lighting: A brilliant new approach | The