Giant Enhancement of Photoluminescence Emission in WS2-Two-Dimensional Perovskite Heterostructures
| Autor: | Jared Crochet, Harry A. Atwater, Aditya D. Mohite, Jean-Christophe Blancon, Tony Low, Ellen Yan, Hao Zhang, Joeson Wong, Mercouri G. Kanatzidis, Deep Jariwala, Yi Rung Lin, Arky Yang, Wei Jiang |
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| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Fabrication Materials science business.industry Mechanical Engineering Bioengineering Heterojunction 02 engineering and technology General Chemistry Electronic structure 021001 nanoscience & nanotechnology Condensed Matter Physics Transition metal Optoelectronics General Materials Science 0210 nano-technology business Electronic band structure Order of magnitude Perovskite (structure) |
| Zdroj: | Nano Letters. 19:4852-4860 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | Transition metal dichalcogenides (TMDCs) and two-dimensional organic and inorganic hybrid lead halide perovskites (2DPVSKs) have emerged as highly promising materials for ultralight and ultrathin optoelectronics application. They both exhibit tunability of electronic properties such as band structure, and they can form heterostructures with various types of two-dimensional materials for novel physical properties not observed in single components. However, TMDCs exhibit poor emission efficiency due to defect states and direct-to-indirect interband transition, and 2DPVSKs suffer from poor stability in ambient atmosphere. Here we report that fabrication of TMDC-on-2DPVSK heterostructures using a solvent-free process leads to novel optical transitions unique to the heterostructure which arise from the hybrid interface and exhibit a strong photoluminescence. Moreover, a two orders of magnitude enhancement of the photoluminescence as compared to WS2 emission is observed. The TMDC on top of 2DPVSK also significantly improves the stability as compared to bare 2DPVSK. Enhanced emission can be explained by electronic structure modification of TMDC by novel interfacial interactions between TMDC and 2DPVSK materials, which shows promise of the heterostructure for high efficiency and stable optoelectronic devices. |
| Databáze: | OpenAIRE |
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