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如果入射光强度太高,导致器件内电流太大,以至于电阴极和倍增极因发射二分解,就会造成光电倍增管的永1久性波坏。因此,使用光电倍增管时,应避免强光直接入射。光电倍增管一般用来测弱光信号。光电池是把光能直接变成电能的器件,可作为能源器件使用,如卫1星上使用的太阳能电池。它也可作为光电子探测器件。光电二极管有耗尽层光电二极管和雪崩光电二极管两种。这种半导体数字显示管的优点是体积小、耗电省、寿命长、响应速度快。半导体pn结区附近成为耗尽层,该层的两侧是相对高的空间电荷区,而耗尽层内通常情况下并不存在电子和空穴。
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