首页|Electroluminescence from pure resonant states in hBN-based vertical tunneling junctions
Electroluminescence from pure resonant states in hBN-based vertical tunneling junctions
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Defect centers in wide-band-gap crystals have garnered interest for their potential in applications among optoelectronic and sensor technologies.However,defects embedded in highly insulating crystals,like diamond,silicon carbide,or aluminum oxide,have been notoriously difficult to excite electrically due to their large internal resistance.To address this challenge,we realized a new paradigm of exciting defects in vertical tunneling junctions based on carbon centers in hexagonal boron nitride(hBN).The rational design of the devices via van der Waals technology enabled us to raise and control optical processes related to defect-to-band and intradefect electroluminescence.The fundamental understanding of the tunneling events was based on the transfer of the electronic wave function amplitude between resonant defect states in hBN to the metallic state in graphene,which leads to dramatic changes in the characteristics of electrons due to different band structures of constituent materials.In our devices,the decay of electrons via tunneling pathways competed with radiative recombination,resulting in an unprecedented degree of tuneability of carrier dynamics due to the significant sensitivity of the characteristic tunneling times on the thickness and structure of the barrier.This enabled us to achieve a high-efficiency electrical excitation of intradefect transitions,exceeding by several orders of magnitude the efficiency of optical excitation in the sub-band-gap regime.This work represents a significant advancement towards a universal and scalable platform for electrically driven devices utilizing defect centers in wide-band-gap crystals with properties modulated via activation of different tunneling mechanisms at a level of device engineering.
Institute for Functional Intelligent Materials,National University of Singapore,Singapore 117544,Singapore
Research Center for Functional Materials,National Institute for Materials Science,Tsukuba 305-0044,Japan
International Center for Materials Nanoarchitectonics,National Institute for Materials Science,Tsukuba 305-0044,Japan
Department of Materials Science and Engineering,National University of Singapore,Singapore 117575,Singapore
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Ministry of Education(Singapore)through the Research Centre of Excellence programMinistry of Education(Singapore)through the Research Centre of Excellence programAcRF Tier 3Ministry of Education,Singapore,under its Academic Research Fund Tier 2Air Force Office of Scientific Research and the Office of Naval Research GlobalJSPS KAKENHIJSPS KAKENHIJSPS KAKENHI
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