Theoretical study on the tunable electronic band structure of Cs2PbI2Cl2/CsPbBr3 halide perovskite heterostructure driven by ferroelectric polarization modulation
| Autor: | Peng-Bin He, Biao Liu, Meng-Qiu Cai, Cheng-Sheng Liao, Ruosheng Zeng, Qiang Wan, Zhuo-Liang Yu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed matter physics Band gap Heterojunction 02 engineering and technology Photoelectric effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials Tetragonal crystal system Colloid and Surface Chemistry 0210 nano-technology Polarization (electrochemistry) Electronic band structure Perovskite (structure) |
| Zdroj: | Journal of Colloid and Interface Science. 597:233-241 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2021.03.121 |
| Popis: | Ferroelectric polarizationhas been considered to be an key factor to tune the structural and photoelectric properties of perovskites and their heterostructures. While there has been growing researches made in the novel phenomena originating from interface formed between oxide perovskites, the effects of ferroelectric polarization on the electronic properties of halide perovskites and their heterostructures are rarely studied. Herein, by using first-principles calculations, all-inorganic halide perovskite heterostructure composed of 3D perovskite tetragonal CsPbBr3 and 2D Ruddlesden-Popper (RP) perovskite Cs2PbI2Cl2 is constructed for disclosing the relationship between the intrinsic polarization of tetragonal CsPbBr3 and electronic band structure of heterostructure. Cs atoms and Pb atoms of tetragonal CsPbBr3 in heterostructure are artificially moved away from the equivalent centers to simulate increased polarization. Our results show that with the spontaneous polarization of tetragonal CsPbBr3 increasing, the bandgap of heterostructure decreases, and the band alignment switches from staggered type-II to broken-gap type-III. Moreover, large cation-anion displacements along z-direction in tetragonal CsPbBr3 can be observed when tensile strains (≥5%) are applied, indicating a increased ferroelectric polarization, which also facilitates the decreasing of bandgap in heterostructure and the type-II-type-III transition of band alignment. Our study suggests that control over the polarization of ferroelectric materials is of great importance to tune the photoelectric properties of perovskite-based devices. |
| Databáze: | OpenAIRE |
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