| 摘要 |
The first layer is located on the first electrode and has the first conductivity type. The second layer is located on the first layer and has the second conductivity type. The third layer is located on the second layer. The second electrode is located on the third layer. The fourth layer is located between the second layer and the third layer, and has the second conductivity type. The third layer includes the first portion and the second portion. The first portion has the second conductivity type and has a peak value of an impurity concentration higher than the peak value of the impurity concentration in the second layer. The second portion has the first conductivity type. The area of the second portion accounts for not less than 20% and not more than 95% of the total area of the first portion and the second portion.
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