物质存在的形式多种多样,固体、液体、气体、等离子体等等。我们通常把导电性差的材质,如煤、人工晶体、琥珀、陶瓷等称为绝缘体。而把导电性比较好的金属如金、银、铜、铁、锡、铝等称为导体。介于导体和绝缘体之间的材质可以简单地称为半导体。与导体和绝缘体相比,半导体材料的发现最慢,直到20世纪30年代,在材质精制技术改良后,半导体的存在才得到学术界的认可。
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