| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
A photodetector by intersubband transition using coupled double quantum well (CDQW) structure by molecular beam epitaxy was fabricated. Dark current was large in the fabricated device, and light detection was impossible. It was found that the barrier height was insufficient for the light detection at room temperature by calculation of the band structure. So, a quantum cascade detector which operates without bias resulting in no dark current was fabricated. However, clear light detection was not possible, and it was necessary to evaluate the accuracy of the structure. By evaluating the CDQW structure, the band structure was modulated by inter diffusion occurring during crystal growth. It was concluded that QW design considering the modulation component was highly required.
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