journal article·2022-12

Ultra‐Narrow Linewidth Photo‐Emitters in Polymorphic Selenium Nanoflakes

Naveed Hussain, Shehzad Ahmed, Hüseyin U. Tepe, Kai Huang, Nardin Avishan, ShiJie He, Mohsin Rafique, Umar Farooq, Talip Serkan Kasirga, Alpan Bek, Rasit Turan, Khurram Shehzad, Hui Wu, Zhiming Wang

Small· Volume 18· Issue 52
Publisher page

Abstract

Abstract Photoluminescence (PL) in state‐of‐the‐art 2D materials suffers from narrow spectral coverage, relatively broad linewidths, and poor room‐temperature (RT) functionality. The authors report ultra‐narrow linewidth photo‐emitters (ULPs) across the visible to near‐infrared wavelength at RT in polymorphic selenium nanoflakes (SeNFs), synthesized via a hot‐pressing strategy. Photo‐emitters in NIR exhibit full width at half maximum (Γ) of 330 ± 90 µeV, an order of magnitude narrower than the reported ULPs in 2D materials at 300 K, and decrease to 82 ± 70 µeV at 100 K, with coherence time (τc) of 21.3 ps. The capping substrate enforced spatial confinement during thermal expansion at 250 °C is believed to trigger a localized crystal symmetry breaking in SeNFs, causing a polymorphic transition from the semiconducting trigonal (t) to quasi‐metallic orthorhombic (orth) phase. Fine structure splitting in orth‐Se causes degeneracy in defect‐associated bright excitons, resulting in ultra‐sharp emission. Combined theoretical and experimental findings, an optimal biaxial compressive strain of −0.45% cm−1 in t‐Se is uncovered, induced by the coefficient of thermal expansion mismatch at the selenium/sapphire interface, resulting in bandgap widening from 1.74 to 2.23 ± 0.1 eV. This report underpins the underlying correlation between crystal symmetry breaking induced polymorphism and RT ULPs in SeNFs, and their phase change characteristics.
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Research context

OpenAlex topics: 2D Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

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

Affiliations

Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu Sichuan 610054 China

Department of Physics Middle East Technical University Ankara 06800 Turkey

Department of Electrical Engineering and Computer Science University of California Irvine Irvine CA 92697 USA

State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China

Micro and Nano‐Technology Program School of Natural and Applied Sciences Middle East Technical University Ankara 06800 Turkey

State Key Laboratory of Information Photonics and Optical Communications & School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

Division of Quantum State of Matter Beijing Academy of Quantum Information Sciences Beijing 100193 China

Department of Physics University of Science and Technology of China Hefei Anhui 230026 China

Institute of Materials Science and Nanotechnology Bilkent University UNAM Ankara 06800 Turkey

The Center for Solar Energy Research and Applications (ODTÜ‐GÜNAM) Ankara 06800 Turkey

Colleges of ISEE and Microelectronics ZJU‐Hangzhou Global Scientific and Technological Innovation Center ZJU‐UIUC Institute State Key Labs of Silicon Materials and Modern Optical Instruments Zhejiang University Hangzhou 310058 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China

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