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什么是 PN 交界处

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最後更新:2023年12月26日

什么是 PN 交界处

PN 结是一种基本元件,特别是在 LED 灯的工作中。它是指 P 型半导体和 N 型半导体之间形成的结。在这个结中,P 型半导体含有过量的带正电荷的空穴,而 N 型半导体则含有过量的带负电荷的电子。当电流通过 PN 结时,N 型区的电子被推向 P 型区,在那里与空穴重新结合。这一重组过程以光的形式释放能量,从而产生光子发射。

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PN 结中使用的材料决定了发射光的波长和颜色。P 型和 N 型半导体的不同组合可以产生不同颜色的光。例如,蓝色 LED 的 N 型区通常使用氮化镓(GaN)材料,P 型区通常使用掺镁氮化镓(Mg-doped GaN)材料。电子和空穴在这些材料中重组,从而发出蓝光。

常見問題

LED 和 PN 结之间有何区别

发光二极管和 PN 结都由一个 PN 结组成,但区别在于发光二极管的 PN 结被透明材料覆盖。这种覆盖物的作用是在正向偏压时引导结发出的光。

PN 在电气中的含义

P-N 结二极管是一种基本的半导体元件,用于调节电路中的电流运动。它由一个正(p)面和一个负(n)面组成。

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