• Sr. Manager of Defect Reduction Department in the Yield Engineering Division.• Interact with foundry customers and provide critical technical support to address customer's requests on defense line improvement and yield stability enhancement.• Champion in making overall organizational strategy and roadmap of defect reduction for all technologies. • Enhance the defense line for defect quality incidents of low occurrence but high impact. • Improve the early detection of defect signal to minimize the negative impact on product quality. • Identify and implement new continuous improvement projects for defect baseline and variation improvement.• Lead 3 groups dedicated on improving the defect limited yield and excursion prevention and containment of FEOL, MOL, and BEOL section of IC fabrication of all technologies.

• Manager of Defect Reduction Department in the Defect Engineering Division.• Lead 4 groups dedicated on improving the defect limited yield of FEOL, MOL, BEOL and FBEOL section of IC fabrication.• Champion in making overall strategy and roadmap of defect reduction for multiple technology.• Lead the efforts of investigating defect quality incidents and improving the defense lines for the production.

• Team Representative (Assistant Manager) of Yield Defect Density (YDD) – BEOL Group in the Defect Engineering Department.• Champion in technical writing. Department lead in training and coaching peer engineers.• In charge of multiple key department KPIs and play a key role in establishing department strategies.• Member of Technical Staff of SAS.• Review Committee of SAS Idea Fair Exhibition.

• Team Representative (Assistant Manager) of Yield Defect Density (YDD) – BEOL Group in the Defect Engineering Department• Oversee the defect limited yield improvement in the MOL/BEOL sections of 14nm and legacy node IC fabrication technology.• Published 2 proceedings in ASMC2019 and 7 presentations in SAS Idea Fair between 2015 and 2019.

• Yield enhancement engineer in 14nm BEOL sector of IC fabrication;• Make and execute the strategy plan of defect reduction through multiple approaches including process integration improvement.

• Yield enhancement engineer in 14nm BEOL sector of IC fabrication;• Led multiple task-force teams to contain the impact of defect excursion incidents, troubleshoot the root cause and implement countermeasures to avoid the re-occurrence of quality issues;• Provided organization level training sessions for fellow engineers and technicians on the subjects of evaluation of defect improvement projects, analytical software platforms and IC fabrication process flow.

• Yield enhancement engineer in 20/28nm BEOL sector of IC fabrication;• Carried out in-depth defect analysis and characterization on critical DOIs to improve defect limited yield.• Conducted quality risk assessment and make suggestions for key defect improvement projects; and oversee the project progress;

Invited Technical Referee for six world renowned scientific publishers:* Royal Chemistry SocietyNanoscales, ChemComm, Journal of Materials Chemistry A, RCS Advances, New Journal of Chemistry;* American Institute of PhysicsAIP Advances; Applied Physics Letters; Journal of Applied Physics* ElsevierSolar Energy, Materials Science in Semiconductor Processing, Thin Solid Films* World ScientificModern Physics Letter B, International Journal of Modern Physics B.* Taylor & FrancisInternational Journal of Sustainable Energy* IOP Science Journal of SemiconductorsPublication0. W. Xia, H. Lin, H.N. Wu, C.W. Tang, I. Irfan, C. Wang, Y. Gao, Te/Cu bi-layer: a low-resistance back contact buffer for thin film CdS/CdTe solar cells, Solar Energy Materials Solar Cells, 128 (2014) 411-420.

Senior Process Engineering working in Contamination Free Manufacturing (CFM) of APE at Fab8.Yield Improvement Engineer of 20LP BEOL and MOLSEM Level II certification: advanced recipe setup for SEM review;Inspection, classification and analysis of defects on patterned wafer using SEM, BFI, SEI, BEV and DFU. Troubleshooting operation and basic automation for SEM, BFI, BEV and DFU. Compiled SOP for DFU operation and basic recipe setup.Recipient of GlobalFoundries Appreciation Award twice.

Internship Project: Directfill WN Rc and erosion improvement study• Participated in advanced fluorine-free tungsten and tungsten nitride deposition process development, including process characterization, film analysis, and daily process qualification. • Reported issues to Sr. engineer and help execute test plans.• Contributed to 20 projects including customer demos, module marathons and new process development.

Doctoral Thesis Research• Conducted independent research on fabricating high-efficiency ( up to 13.5%) ultra-thin CdS/CdTe solar cells with CdTe film thickness of 1.2~1.7µm. • Developed a novel fabrication technique for ternary semiconductor materials Cd1-xZnxS, and making high-efficiency (~11%) thin film Cd1-xZnxS/CdTe solar cells.• Invented a low-resistance electrical contact material containing Te and Cu for thin film CdS/CdTe solar cells.• Co-invented a novel back contact buffer layer, MoOx, for thin film CdS/CdTe solar cells.• Designed and built high-throughput PVD deposition system for thin film semiconductor materials.• Tutored two master students and two undergraduate students in their research projects.Publications:1. W. Xia, H. Lin, H.N. Wu and C.W. Tang, Effects of high-temperature annealing on ultra-thin CdTe solar cells, Thin Solid Films, 520 (2011) 563.2. W. Xia, J. A. Welt, H. Lin, H.N. Wu, M.H. Ho and C.W. Tang, Fabrication of Cd1-xZnxS films with controllable zinc doping using a vapor zinc chloride treatment, Sol. Energy Mater. Sol. Cells, 94 (2010) 2113. 3. H. Lin, W. Xia, H.N. Wu, C.W. Tang, CdS/CdTe solar cells with MoOx as back contact buffers, Appl. Phys. Lett., 97 (2010) 123504.4. Irfan, W. Xia , H. Lin, C.W. Tang, H. Ding and Y. Gao, Nitric-phosphoric acid etching effects on the surface chemical composition of CdTe thin film, Thin Solid Films, 520 (2012) 1988.5. H. Lin, W. Xia, H.N. Wu, Irfan, Y. Gao and C.W. Tang, MoOx as an efficient and stable back contact buffer for thin film CdTe solar cells, MRS Symposium Proceedings, 1447 (2012) 026. H. Lin, Irfan, W. Xia, H.N. Wu, Y. Gao and C.W. Tang, MoOx back contact for CdS/CdTe thin film solar cells: preparation, device characteristics, and stability, Sol. Energy Mater. Sol. Cells, 99 (2012) 349.7. Irfan, H. Lin, W. Xia, H.N. Wu, C.W. Tang and Y. Gao, The effect of MoOx inter-layer on thin film CdTe/CdS solar cell, Sol. Energy Mater. Sol. Cells, 105 (2012) 86, .

PhD student majoring in bioengineering. • Coursework study in Advanced Engineering Computation, and Fluorescence Method in Biology and Chemistry• Teaching assistant for Biosystems and Signal Analysis, and Biomaterials • Synthesized a new chromophore for solid state dye laser and polymer solar cell applications: N-Phenyl-4-dimethyalamino-1,8-naphthalimide (Ph-ANI)• Characterized solvatochromic properties of Ph-ANI using UV/Vis spectroscopy, fluorescence spectroscopy, and cyclic voltammetryPublications:8. D. Bao, B. Millare, W. Xia, B.G. Steyer, A.A. Gerasimenko, A. Ferreira and V. Vullev, Electrochemical oxidation of ferrocene manifests a strong dependence on the concentration of the supporting electrolyte for non-polar solvents, J. Phys. Chem. A, 113 (2009) 1259.9. J. Wan, A. Ferriera, W. Xia, C. Chow, K. Takechi, P.V. Kamat, G. Jones and V. Vullev. Solvent dependence of the charge-transfer properties of a quaterthiophene-anthraquinone dyad, J. Photochem. Photobiol. A, 197 (2008) 364.

Master Thesis Research Institute of Process Engineering, CAS 2003-2006• Designed and prepared novel ferrous cathodic material for lithium ion batteries from hydrotalcite-like compounds precursors; conducted solvothermal synthesis of hydrotalcite with a novel morphology; and participated in the study of hydrotalcite as thermal stabilizer in polyvinylchloride • Built a system for assembling and testing lithium-ion batteries including performing apparatus for cathodic materials, glovebox for assembling batteries and electrochemical workstation for cyclic voltage-current test.Publications:10. W. Xia, W. Meng, R. Yu, X. Xing, D. Wang, Y. Chen and T. Mikio. An effective route for porous ferrihydrite preparation from layered double hydroxide precursors, Chem. Lett., 35 (2006) 656. 11. W. Xia, W. Meng, K. Zhu, R. Yu, X. Xing and D. Wang. Preparation of a porous iron oxyhydroxide from layered double hydroxides precursors. Clay Sci., 12 (2006) 285.12. W. Xia, W. Meng, R. Yu, J. Yao, Y. Chen, and Dan. Wang. Preparation and characterizations of 2-line ferrihydrite, J. Rare Earth., 24< Special Issue > (2006) 268. 13. H. Wang, X. Lai, W. Xia, R. Yu, D. Mao, C. Xing, J. Yao, D. Wang and X. Li. Preparation of ferrihydrite and their electrode performances in rechargeable lithium, Chem. Res. Chin. Univ., 24 (2008) 383.