In continuous-wave (cw) laser lateral crystallization of amorphous silicon (a-Si) thin films, the effects of cap SiO2 thin films were investigated. The thickness of the cap SiO2 film was 10 nm, which is sufficiently thin to exclude anti reflection effect. The cap SiO2 thin films suppressed the generation of voids during the cw laser crystallization, and the available crystallization condition to form lateral-crystallized polycrystalline silicon (poly-Si) thin films was expanded. By using the cap SiO2 thin films, the surface of the lateral-crystallized poly-Si thin films became smooth, and an average roughness of 1.3nm was achieved.
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