Primary Duties & Responsibilities
Develop and optimize wet etch processes for VCSELs, photodiodes, and edge-emitting lasers (EMLs) on GaAs and InP substrates. Define and control etch chemistry, etch rate, isotropic vs. anisotropic etching, selectivity, and undercut management to meet stringent device performance criteria. Utilize metrology tools such as AFM, SEM, ellipsometry, profilometry, XPS, XRD, and optical interferometry for process characterization and defect analysis. Troubleshoot etch process deviations, material compatibility issues, and surface roughness effects, implementing corrective actions to ensure high device yield and process stability. Work closely with device engineers and integration teams to integrate wet etch processes into the overall semiconductor fabrication flow. Establish and maintain Statistical Process Control (SPC) methodologies for process mon...