| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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| Outline of Final Research Achievements |
For understanding the quantum confinement effects on hot carrier transfer, we synthesized several kinds of semiconductor quantum dots (QDs) and nanoplatelets (NPLs) by a colloidal synthetic method, and Au and Pt metal nanoparticles (NPs) were attached on the surface of semiconductor nanocrystals. We found that hot carrier transfer takes place from 1P(e) state in Au-CdSe QDs, whereas no hot carrier transfer was detected in Au and Pt-CdSe NPLs even though the ultrafast carrier transfer faster than the instrument response function (~ 60 fs) exists in Pt-CdSe NPLs. This difference between QDs and NPLs can be interpreted in terms of very efficient and ultrafast phonon emission from higher excited states of CdSe NPLs and phonon bottle neck in CdSe QDs. Charged excitons in CdSe QDs and NPLs were also examined by photochemical electron doping to QDs and NPLs.
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