1. Tip-Induced Strain Engineering of a Single Metal Halide Perovskite Quantum Dot
- Author
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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, and Yeonjeong Koo
- Subjects
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) - Abstract
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.
- Published
- 2021