耗尽层 Depletion region
（重定向自Space charge region）
耗尽层(depletion region)，又称空乏区、阻挡层、势垒区(barrier region)，是指PN结中在漂移运动和扩散作用的双重影响下载流子数量非常少的一个高电阻区域。耗尽层的宽度与材料本身性质、温度以及偏置电压的大小有关。
Space charge region
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Depletion region 耗尽层
（重定向自Space charge region）
![Top: p–n junction before diffusion; Bottom: After equilibrium is reached](/Images/godic/202502/12/Pn_Junction_Diffusion_and_Drift.svg1307.png")
![Top: hole and electron concentrations through the junction; Second from top: charge densities; Third: electric field; Bottom: electric potential](/Images/godic/202502/12/Pn-junction-equilibrium-graphs1307.png")
![The total width of the depletion region is a function of applied reverse-bias and impurity concentration](/Images/godic/202502/12/Depletion_width1307.png")
In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an electric field. The only elements left in the depletion region are ionized donor or acceptor impurities.