Strain-Induced Enhancement of Electroluminescence from Highly Strained Germanium Light-Emitting Diodes
| Autor: | James S. Harris, Colleen S. Fenrich, Theodore I. Kamins, Muyu Xue, Yi Zhang, Ching-Ying Lu, Jialin Jiang, Kai Zang, Jianfeng Gao, Ming Cheng, Junqiang Sun, Matthew Morea |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
chemistry.chemical_element Germanium 02 engineering and technology Electroluminescence 01 natural sciences law.invention 010309 optics symbols.namesake Strain engineering law 0103 physical sciences Electrical and Electronic Engineering Electronic band structure business.industry Photonic integrated circuit 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry symbols Optoelectronics Direct and indirect band gaps 0210 nano-technology Raman spectroscopy business Biotechnology Light-emitting diode |
| Zdroj: | ACS Photonics. 6:915-923 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.8b01553 |
| Popis: | The full exploration of Si-based photonic integrated circuits is limited by the lack of an efficient light source that is compatible with the complementary metal–oxide–semiconductor process. Highly strained germanium (Ge) is a promising solution, as its band structure can be fundamentally altered by introducing tensile strain. However, the main challenge lies in the incorporation of an electrical structure while maintaining high strain with uniform distribution in the active region. Here we present highly strained Ge LEDs driven by lateral p–i–n junctions and report the strain-induced enhancement of electroluminescence (EL) from Ge. Raman characterization shows that 1.76% strain along the ⟨100⟩ direction with relatively uniform strain distribution is achieved. The observed strain-induced red-shifts of EL spectra agree well with the theoretical prediction, revealing that the direct band gap of Ge can be tuned in the range of 0.785 eV (1580 nm) to 0.658 eV (1885 nm). This work offers a pathway toward a stra... |
| Databáze: | OpenAIRE |
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