| 摘要 |
PROBLEM TO BE SOLVED: To enable a high-frequency electrical signal to be extracted with lower image multiplication factor.SOLUTION: An avalanche photodiode comprises a first field control layer 105 and a second field control layer 106, which are formed between a second contact layer 103 and an avalanche layer 104, and composed of group III-V compound semiconductor, and have a second conductivity type. The second field control layer 106 has smaller bandgap energy in comparison with the first field control layer 105. |
