2.1.2 led 的主要参数与特性 led 是利用化合物材料制成 pn 结的光电器件，它具备 pn 结结型器件的电学特性（i－v 特性、c－v 特性）和光学特性（光谱响应特性、发光光强指向特性、时. 下面从 led 的衬底、外延片、pn 结电极三部分来具体讲解 led 的制作工艺。 1.2.1 led 衬底材料的选用 对于制作 led 芯片来说，衬底材料的选用是首要考虑的问题。应该采用哪种合适的衬.
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