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2020 Fiscal Year Final Research Report

Spatio-temporal optical analysis of novel photon conversion mechanisms in supramolecular ferroelectrics

Research Project

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Project/Area Number 19K23592
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Noma Taishi  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 (30846283)

Project Period (FY) 2019-08-30 – 2021-03-31
Keywords超分子 / 極性 / キラリティ / 光電変換 / シフトカレント / 光第二高調波発生
Outline of Final Research Achievements

In this study, the light polarization dependence of photocurrent revealed that a novel photoelectric conversion mechanism “shift current” is generated from chiral subphthalocyanine single crystals. It was also found that the light polarization dependence of the photocurrent of chiral perovskite single crystals is different at the crystal surface and at the crystal/electrode interface. This suggests that different photoelectric conversion phenomena occur at the crystal surface and at the crystal/electrode interface, which is an important result leading to the clarification of the photoelectric conversion mechanism of chiral perovskites.

Free Research Field

応用物理物性

Academic Significance and Societal Importance of the Research Achievements

本研究で測定に成功したシフトカレントは物質の反転対称性の破れによって生じる新奇的な光電変換プロセスである。先行研究で評価されてきた無機結晶のシフトカレントとは異なり、分子のキラリティなど有機材料特有の性質に起因して発生している点が新しく学術的に意義がある。またシフトカレントは原理的にエネルギー損失が少なく、高性能な光電変換素子を設計することが可能である。将来は太陽光発電などの再生可能エネルギーの普及に貢献でき、その社会的意義は大きいと言える。

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Published: 2022-01-27  

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