2022 Fiscal Year Final Research Report
Quantitative elucidation of photo-generated charge carrier mobility and transfer dynamics in perovskite semiconductor films
| Project/Area Number |
19H02813
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 36020:Energy-related chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
関 修平 京都大学, 工学研究科, 教授 (30273709)
豊田 岐聡 大阪大学, 大学院理学研究科, 教授 (80283828)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 太陽電池 / 光触媒 / 超高速分光 |
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| Outline of Final Research Achievements |
The following three outcomes were obtained.
(1)As a result of studying charge carrier dynamics of lead halide perovskite films, charge carrier trapping occurs from 200 ps to 1 ns. We also found that it is possible to estimate charge carrier trap density by conducting excitation intensity dependence on electron-hole recombination dynamics.(2)We found that appropriate doping into the spiro-OMeTAD layer does not influence charge separation rate and yield, however retards charge recombination rates.(3)CsSn2Br5 nanocubes were successfully synthesized. Surprisingly, Sn2+ in CsSn2Br5 perovskite is oxidized by water and oxygen molecules in air, forming Cs2SnBr6 perovskite structure. Furthermore, Cs2SnBr6 nanocrystals were de-stabilised by a small amount of water and oxygen molecules inside non-polar solvent.
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| Free Research Field |
物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究課題の成果から、高効率ペロブスカイト太陽電池を設計するための有益な指針が得られた。
(1)キャリアのトラップ密度を見積もる方法が確立されたことから、トラップ密度の太陽電性能に与える影響を評価することが可能になった。(2)ホール・電子移動度が高い輸送層を選択することにより、太陽電池の開放端電圧とフィルファクタの向上が期待できる。(3)スズペロブスカイト太陽電池の高効率化のためには、水分と酸素と反応しないようにバッファ層を設ける必要がある。一方、水分と酸素存在下でも分解を抑制可能な組成を見つけることが必要である。
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