2021 Fiscal Year Annual Research Report
Quantum-Assisted Photoelectric Effects in Perovskite Solar Cells
| Project/Area Number |
20K15135
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
王 映樵 国立研究開発法人物質・材料研究機構, 若手国際研究センター, ICYS研究員 (60838035)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Keywords | perovskite solar cell / 2D/3D perovskite / Interface / Band mapping / STM |
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| Outline of Annual Research Achievements |
Graded 2D perovskite capping shells with continuously upshifting valence bands, produced by tailored dimensional engineering, can effectively extract holes from 3D perovskite cores. Real-space observation of electronic structures will fully reveal the operating mechanisms of 2D/3D hybrid perovskite solar cells (PSCs). In this financial year, the light-modulated scanning tunneling microscopy visualizes the cross-sectional band alignment across 2D (C4H9NH3)2(CH3NH3)n-1PbnI3n+1/3D CH3NH3PbI3 stacked perovskites. By systematically analyzing their electronic configuration, the mixed-dimensional perovskite band structure along the vertical 3D-to-2D direction can be spatially resolved. Remarkably, the electric field in the 2D perovskite is larger under light illumination than under dark conditions, resulting in an increase in the concentration of holes and electrons distributed in the 2D and 3D perovskites, respectively. Benefiting from this electronic reconstruction, charge recombination is suppressed, thereby significantly promoting the 2D/3D PSC performance. Moreover, our method opens an avenue for direct, local mapping of optoelectronic device energy levels. (Nano Energy, 2021, 89, 106362)
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Research Products
(8 results)
