Hao Chen

Hao Chen

Researcher in functional oxide films, probing defect-driven electronic and optical/transport properties using synchrotron X-ray spectroscopy and advanced methods.

Portfolio

Defective WO3-x Thin Films

Understanding defective WO3-x thin films through complementary experimental techniques
Key Activities:
- Quantified defect concentrations using EDXS, XPS, and Auger spectroscopy
- Developed ellipsometry models to resolve depth-dependent dielectric profiles
- Linked XANES/EXAFS results to oxidation states, local coordination, and oxygen vacancies
- Implemented Python-based NNMF workflows to extract hidden components from large RIXS datasets
- Established SEM/AFM protocols for nanoscale morphology and surface analysis
- Correlated XRD and Raman spectroscopy to identify amorphous-to-crystalline transitions
- Measured electrical transport, relating conductivity to defect chemistry
- Probed ultrafast carrier dynamics using pump–probe transient absorption spectroscopy

Operando XAS Study of Novel Cathode Material for Solid Oxide Fuel Cells

Real-time investigation of functional cathode materials using synchrotron-based spectroscopy
Key Activities:
- Performed operando XAS to monitor electronic and structural evolution under working conditions
- Developed Python-based workflows to decouple thermal and chemical contributions in operando datasets

Controlled Growth and Characterization of Correlated Electron Systems

Thin film growth and electronic structure characterization using synchrotron-based spectroscopy
Key Activities:
- Optimized pulsed laser deposition for epitaxial growth and interface control in complex oxides
- Quantified film periodicity and interface sharpness using combined XRD/XRR analysis
- Validated composition and stoichiometry through complementary XPS and SEM–EDX measurements

3-Month Research Stay – ESRF (France)

Synchrotron-based experiments and user support
Key Activities:
- Trained in synchrotron instrumentation and advanced experimental techniques
- Performed X-ray spectroscopy experiments and data analysis
- Assisted beamline users during experimental campaigns