Visualizing band alignment across 2D/3D perovskite heterointerfaces of solar cells with light-modulated scanning tunneling microscopy

Po Cheng Huang, Shao Ku Huang, Ting Chun Lai, Min Chuan Shih, Hung Chang Hsu, Chun Hsiang Chen, Cheng Chieh Lin, Chun Hao Chiang, Chi Ying Lin, Kazuhito Tsukagoshi, Chun Wei Chen*, Ya Ping Chiu, Shiow Fon Tsay, Ying Chiao Wang

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

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.

原文英語
文章編號106362
期刊Nano Energy
89
DOIs
出版狀態已發佈 - 2021 11月

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 材料科學(全部)
  • 電氣與電子工程

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