My research interests focus on investigating device physics and photophysics of organic and organic-inorganic hybrid optoelectronic materials and devices. I utilize ultrafast laser spectroscopy to understand excited state dynamics and synchrotron based X-ray techniques to characterize materials structure. Combining with the study on device physics, I seek to better understand basic physics, chemistry, and potential application of next-generation solar cells, light-emitting diodes, transistors, and lasers.- Efficient, stable, large-area metal halide perovskite solar cells and minimodules- Scaleup perovskite technology - Femtosecond laser transient absorption and reflection spectroscopy