Halide-Substituted Electronic Properties of Organometal Halide Perovskite Films: Direct and Inverse Photoemission Studies
| Autor: | Mikio Sato, Yan Qing Li, Kaname Kanai, Nobuo Ueno, Chi Li, Satoshi Kera, Jian-Xin Tang, Zhong Zhi Xie, Jian Wei, Harunobu Koike |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Band gap Photoemission spectroscopy Inverse photoemission spectroscopy Analytical chemistry Halide 02 engineering and technology Methylammonium lead halide 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Blueshift chemistry.chemical_compound chemistry Ionization Physical chemistry General Materials Science Nanoscience & Nanotechnology 0210 nano-technology 03 Chemical Sciences 09 Engineering Perovskite (structure) |
| Zdroj: | ACS applied materialsinterfaces. 8(18) |
| ISSN: | 1944-8252 |
| Popis: | Solution-processed perovskite solar cells are attracting increasing interest due to their potential in next-generation hybrid photovoltaic devices. Despite the morphological control over the perovskite films, quantitative information on electronic structures and interface energetics is of paramount importance to the optimal photovoltaic performance. Here, direct and inverse photoemission spectroscopies are used to determine the electronic structures and chemical compositions of various methylammonium lead halide perovskite films (MAPbX3, X = Cl, Br, and I), revealing the strong influence of halide substitution on the electronic properties of perovskite films. Precise control over halide compositions in MAPbX3 films causes the manipulation of the electronic properties, with a qualitatively blue shift along the I → Br → Cl series and showing the increase in ionization potentials from 5.96 to 7.04 eV and the change of transport band gaps in the range from 1.70 to 3.09 eV. The resulting light absorption of MAPbX3 films can cover the entire visible region from 420 to 800 nm. The results presented here provide a quantitative guide for the analysis of perovskite-based solar cell performance and the selection of optimal carrier-extraction materials for photogenerated electrons and holes. |
| Databáze: | OpenAIRE |
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