2023 Fiscal Year Final Research Report
Theoretical study on optical responses of excitons in perovskite solar-cell materials
| Project/Area Number |
20K03798
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 太陽電池ペロブスカイト / 励起子 / 遮蔽効果 |
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| Outline of Final Research Achievements |
We have theoretically studied the electron-hole interaction effect, or, the exciton effect, on the optical properties of solar cell perovskite materials. The analysis on the magnetic spectroscopy of the bulk crystals leads to the fact that the screening effect due to the lattice vibration strongly suppresses the exciton binding, and the screening effect also play an important role in the size dependent binding energy of the biexcitons and charged excitons in quantum dots. We have shown that the intensity of two-photon absorption is enhanced by the exciton effect and that the spin splitting of the bands can be determined from the polarization dependence.
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| Free Research Field |
物性理論
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| Academic Significance and Societal Importance of the Research Achievements |
ポストシリコン太陽電池として注目されるハロゲン化鉛ペロブスカイト材料は，近年，良質な単結晶の生成が可能となり，光学素子としての応用も期待されている．光学応答とは光吸収による電子・正孔対生成，発光による電子・正孔対消滅過程であり，電子・正孔間相互作用が強く影響を及ぼす．波長変換に必要な非線形光学応答は，励起子を共鳴的に生成しない場合でも，電子・正孔間引力により増強される．量子閉じ込め構造による波長選択にも，そのサイズの制御と同時に，励起子や励起子分子などの束縛状態の同定が必要になる．つまり，光学応答の定量的予言に相互作用効果の定量的評価が不可欠であり，本研究の成果が役立つと期待される．
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