DataVXACS NanoPaper
journal article·2021-05-25

Tip-Induced Strain Engineering of a Single Metal Halide Perovskite Quantum Dot

Hyeongwoo Lee, Ju Young Woo, Dae Young Park, Inho Jo, Jusun Park, Yeunhee Lee, Yeonjeong Koo, Jinseong Choi, Hyojung Kim, Yong-Hyun Kim, Mun Seok Jeong, Sohee Jeong, Kyoung-Duck Park

ACS Nano· Volume 15· Issue 5
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Source abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Strong Light-Matter Interactions · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea

Manufacturing Process Platform R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Republic of Korea

Department of Physics, Hanyang University, Seoul 04763, Republic of Korea

Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea

Graduate School of Nanoscience and Technology, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea

Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea

Artificial Atom and Quantum Materials Center, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea

Funding

Ulsan National Institute of Science and Technology · National Research Foundation of Korea · Gyeonggi-do Regional Research Center · Korea Institute of Industrial Technology

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