Time-Resolved X‑ray Absorption Spectroscopy and Diffraction toward Solar Energy Conversion

Area of Science:

• Materials Science
• Physical Chemistry
• Spectroscopy

Background:

• Time-resolved X-ray absorption spectroscopy (TR-XAS) and diffraction (TR-XRD) are essential for studying light-driven processes.
• Understanding excited and intermediate states is crucial for solar energy conversion materials.

Purpose of the Study:

• To review technical advancements in TR-XAS and TR-XRD at the Advanced Photon Source (APS).
• To highlight applications of these techniques in solar energy conversion research.
• To showcase innovative methodologies for studying transient material states.

Main Methods:

• Utilizing a laser pump-X-ray probe scheme for time-resolved measurements.
• Investigating dynamics across picosecond (ps) to microsecond (μs) timescales.
• Developing novel TR-XAS and TR-XRD methods by integrating X-ray and laser pulses with specific timing patterns.

Main Results:

• TR-XAS and TR-XRD provide element-specific, atomic-level insights into transient states.
• These techniques enable the characterization of diverse solar energy materials, including molecular photocatalysts, metal halide perovskites, and semiconductors.
• Studies cover materials in various forms: solutions, suspensions, and solids.

Conclusions:

• Advanced TR-XAS and TR-XRD methodologies at APS are pivotal for unraveling complex dynamics in light-driven materials.
• These insights are critical for the rational design of next-generation materials with improved solar energy conversion efficiencies.