|Budget Amount *help
¥18,850,000 (Direct Cost: ¥14,500,000、Indirect Cost: ¥4,350,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2018: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
|Outline of Final Research Achievements
We investigated the impacts of the protein environment and intramolecular vibrations on primary charge separation at the photosystem II reaction center (PSII-RC). We reported that individual vibrational modes play a minor role in promoting charge separation. Nevertheless, these small contributions accumulate to considerably influence the charge separation rate, resulting in subpicosecond charge separation almost independent of the driving force and temperature.
The recombination of the once-separated electron and hole is a major loss mechanism in photovoltaic systems. We investigated a potential ratchet mechanism arising from the combination of quantum delocalization and its destruction. We demonstrated that the non-Markovian effect originating from the slow polaron formation suppresses the electron-transfer reaction back to the interfacial charge-transfer state stabilized at the donor-accepter interface and that it plays a role in maintaining the long-range electron-hole separation.