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光电二极管也是由半导体PN结构成的。PN结受到光照射后，也能产生电子和空穴对，在半导体中增加了少数载流子的数量，这些载流子在反向偏置时，就形成漂移电流，使反向电流增大，光照强度不同，反向电流的大小也不同。所以电路中的电流将随光照的强弱而改变，这样的二极管称为光电二极管。可以用它制作光控元件，其符号如下图所示。常见的太阳能电池也是光电管的一种，太阳能电池不需要外加电源，它能够直接将光能转变成电能。下表所示的是2CU型两种硅光电管的参数。