III-V Heterostructure Grown on 300mm Ge/Si Wafer for Large-Scale Fabrication of Red μ-LEDs

We report on the design, fabrication and characterization of red <inline-formula> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>-LEDs directly grown on large-scale silicon wafers through a superior-quality Ge buffer. 300mm Ge/Si substrates with a threading dislocation density (TDD) of ~107 cm−2 were successfully achieved, then followed by the growth and process of visible 649nm AlGaAs-based red emitters. The electro-optical properties of various red <inline-formula> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>-LEDs with diameters ranging from 10 to <inline-formula> <tex-math notation="LaTeX">$100\mu \text{m}$ </tex-math></inline-formula> are investigated, showing promising performances. Those results coupled with numerical analysis with a model based on transfer-matrix with dipole source-terms help us better identify the main challenges limiting the efficiencies of our devices, while providing optimization routes to alleviate them. We believe that these results could pave the way for a monolithic large-scale and low-cost integration of red <inline-formula> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>-LEDs on 300mm Si-CMOS driving circuits and for the fabrication of high-resolution RGB microdisplays that see use in various applications in optoelectronics.