Manipulation of charge-transfer process under light matter hybridized state

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22543
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: OKADA DAICHI 国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (10880346)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 光化学 / 光起電力 / 電荷分離 / 非線形光学応答

Outline of Final Research Achievements

The photovoltaic effect is an essential properties for modern society. It arises mainly from the charge separation process at the P-N junction. On the other hand, bulk photovoltaic effects exhibited by symmetry-breaking materials have also recently attracted attention. In this study, we investigate how the light-matter hybridized state which are generated by coherent coupling between light and matter in optical cavity, affects these processes. The carrier lifetime of the P3HT/PCBM mixture was measured by microwave conductivity measurements under light-matter hybridized state. However, no significant difference was found between inside cavity and outside cavity. On the other hand, we reveal that the second-order nonlinear optical effects, which are important for improving the bulk photovoltaic effect, is possible to be increased by one order of magnitude inside the optical cavity.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

近年、光と物質の強結合を用いた物性制御法が注目されはじめている。強結合状態とは、光共振器中において生じる光と物質の複合状態である。強結合状態の理解は、共振器を用いた自在な物性制御術を生み出すこととなり、サイエンスの発展に貢献する。本研究では、光起電力効果に対する基礎的な知見を得ることができた。特に非線形光学応答の増大は、現在注目されているバルク光起電力効果の高効率化につながると期待できる。