In a heterojunction avalanche photodiode using beta-gallium oxide (β-Ga 2 O 3 ) including an oxidation electrode and a reduction electrode, a material doped with p + type gallium nitride in contact with the oxidation electrode on the oxidation electrode 1 gallium nitride layer, located on the first gallium nitride layer, a second gallium nitride layer doped with p-type gallium nitride, an n-type beta-oxidation in which the second gallium nitride layer is PN-bonded on the second gallium nitride layer It is located on the first gallium oxide layer doped with gallium, the first gallium oxide layer, and is located on the top of the second gallium oxide layer and the second gallium oxide layer doped with n - type beta-gallium oxide, and is located on top of the n + type beta. -Disclosed is a photodiode comprising a third gallium oxide layer doped with gallium oxide.
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