光敏电阻就这个特性啊.光照的时候光敏电阻吸收光子 使禁带上的电子吸收能量跃迁到导带上...而光强减弱 所能吸收的光子数减少 从而减少了跃迁到导带的电子
使电阻变大 这里只有导带的电子和对应的空穴参与导电 禁带电子不参与导电
大概是这个样子的 其中有Solid State Physics的知识 你学了的话就很容易解决了
Physics(LDR） why the reading on the voltmeter increases as t
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