Tip-Induced Strain Engineering of a Single Metal Halide Perovskite Quantum Dot
| Autor: | Yong-Hyun Kim, Dae Young Park, Sohee Jeong, Yeunhee Lee, Ju Young Woo, Hyeongwoo Lee, Jinseong Choi, Inho Jo, Jusun Park, Hyojung Kim, Mun Seok Jeong, Kyoung-Duck Park, Yeonjeong Koo |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence business.industry Band gap General Engineering General Physics and Astronomy Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Strain engineering Quantum dot Optoelectronics General Materials Science Photonics 0210 nano-technology business Plasmon Perovskite (structure) |
| Zdroj: | ACS nano. 15(5) |
| ISSN: | 1936-086X |
| Popis: | Strain engineering of perovskite quantum dots (pQDs) enables widely tunable photonic device applications. However, manipulation at the single-emitter level has never been attempted. Here, we present a tip-induced control approach combined with tip-enhanced photoluminescence (TEPL) spectroscopy to engineer strain, bandgap, and the emission quantum yield of a single pQD. Single CsPbBrxI3-x pQDs are clearly resolved through hyperspectral TEPL imaging with ∼10 nm spatial resolution. The plasmonic tip then directly applies pressure to a single pQD to facilitate a bandgap shift up to ∼62 meV with Purcell-enhanced PL increase as high as ∼105 for the strain-induced pQD. Furthermore, by systematically modulating the tip-induced compressive strain of a single pQD, we achieve dynamical bandgap engineering in a reversible manner. In addition, we facilitate the quantum dot coupling for a pQD ensemble with ∼0.8 GPa tip pressure at the nanoscale estimated theoretically. Our approach presents a strategy to tune the nano-opto-electro-mechanical properties of pQDs at the single-crystal level. |
| Databáze: | OpenAIRE |
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