Patent ID: 11881674
Assignee: KABUSHIKI KAISHA TOSHIBA
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 5:
6. The device according to claim 5, wherein
the second semiconductor layer further includes a third layer provided between the first layer and the second layer,
the third layer includes a first-conductivity-type impurity with a higher concentration than the concentration of first-conductivity-type impurity in the first layer and with a lower concentration than the concentration of first-conductivity-type impurity in the second layer,
the third layer covers the plurality of first protrusions so that the first space remains between the adjacent first protrusions, and
the third layer includes a third portion provided between the adjacent third protrusions, the second space between the adjacent third protrusions being filled with the third portion of the third layer, the portion of the third layer having a width equal to a width of the second space between the adjacent third protrusions.