期刊
ADVANCED MATERIALS
卷 33, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202008234
关键词
exciton funneling; strain‐ engineering; tip‐ enhanced photoluminescence spectroscopy; transition metal dichalcogenide monolayer; wrinkle
类别
资金
- National Research Foundation of Korea (NRF) [2019K2A9A1A06099937, 2020R1C1C1011301]
- KISTI [KSC-2019-CRE-0221]
- Institute for Basic Science [IBS-R011-D1]
- Basic Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2018R1A2B2002302]
- Technology Innovation Program - Ministry of Trade, Industry, & Energy (MOTIE, Republic of Korea) [20005750]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea - MSIT [NRF-2020R1A4A1019566]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20005750] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R011-D1-2021-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1A2B2002302, 2020R1C1C1011301, 5199990414462] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study demonstrates dynamic nano-mechanical strain-engineering of naturally-formed wrinkles in a WSe2 monolayer using hyperspectral adaptive tip-enhanced PL (a-TEPL) spectroscopy. The results show that by dynamically adjusting the wrinkles at the nanoscale, exciton dynamics and emission properties can be tuned reversibly. This provides a new strategy for robust, tunable, and ultracompact nano-optical sources in atomically thin semiconductors.
The tunability of the bandgap, absorption and emission energies, photoluminescence (PL) quantum yield, exciton transport, and energy transfer in transition metal dichalcogenide (TMD) monolayers provides a new class of functions for a wide range of ultrathin photonic devices. Recent strain-engineering approaches have enabled to tune some of these properties, yet dynamic control at the nanoscale with real-time and -space characterizations remains a challenge. Here, a dynamic nano-mechanical strain-engineering of naturally-formed wrinkles in a WSe2 monolayer, with real-time investigation of nano-spectroscopic properties is demonstrated using hyperspectral adaptive tip-enhanced PL (a-TEPL) spectroscopy. First, nanoscale wrinkles are characterized through hyperspectral a-TEPL nano-imaging with <15 nm spatial resolution, which reveals the modified nano-excitonic properties by the induced tensile strain at the wrinkle apex, for example, an increase in the quantum yield due to the exciton funneling, decrease in PL energy up to approximate to 10 meV, and a symmetry change in the TEPL spectra caused by the reconfigured electronic bandstructure. Then the local strain is dynamically engineered by pressing and releasing the wrinkle apex through an atomic force tip control. This nano-mechanical strain-engineering allows to tune the exciton dynamics and emission properties at the nanoscale in a reversible fashion. In addition, a systematic switching and modulation platform of the wrinkle emission is demonstrated, which provides a new strategy for robust, tunable, and ultracompact nano-optical sources in atomically thin semiconductors.
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