https://scholars.lib.ntu.edu.tw/handle/123456789/598361
標題: | Visualizing band alignment across 2D/3D perovskite heterointerfaces of solar cells with light-modulated scanning tunneling microscopy | 作者: | CHUN-WEI CHEN YA-PING CHIU |
關鍵字: | 2D/3D perovskite;Band mapping;Interface;Perovskite solar cells;Scanning tunneling microscopy;Cell engineering;Electric fields;Electronic structure;Interfaces (materials);Optoelectronic devices;Perovskite;2d/3d perovskite;Band alignments;Electronic configuration;Electronic.structure;Hetero-interfaces;NH$-3$;Operating mechanism;Real-space observations;Spatially resolved;Mapping | 公開日期: | 2021 | 卷: | 89 | 來源出版物: | Nano Energy | 摘要: | 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). Here, for the first time, 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. ? 2021 The Authors |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85111266308&doi=10.1016%2fj.nanoen.2021.106362&partnerID=40&md5=d10630d8d3f8c21fb856164c8c7368b3 https://scholars.lib.ntu.edu.tw/handle/123456789/598361 |
ISSN: | 22112855 | DOI: | 10.1016/j.nanoen.2021.106362 |
顯示於: | 材料科學與工程學系 |
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