Xiong, Wei
Investigation of charge transfer mechanism in nanomaterials with novel ultrafast spectroscopies

Contact Information
Assistant Professor of Chemistry and Biochemistry

Office: Pacific Hall B100C
Phone: 858-534-0270
Email: w2xiong@ucsd.edu
Web: ultrafast.ucsd.edu
Group: View group members
Education
2011 Ph.D., University of Wisconsin, Madison
2006 B.S., Peking University
Appointments
2014 Asst. Professor, UCSD
2011 Postdoc, University of Colorado, Boulder
Awards and Academic Honors
2015
DARPA Young Faculty Award (YFA)
Research Interests
1. Theoretical results demonstrate that interfacial molecular conformations directly influence charge separation dynamics in polymer blend solar cells. Experimentally, it would be very beneficial to be able to monitor the interaction between interfacial conformations and dynamics. However, since charge separation mostly happens at disordered hidden interfaces in thick samples, it is very challenging to capture such processes using existing spectroscopic techniques. We will develop ultrafast surface sensitive spectroscopy to follow both the charge separation dynamics and interfacial conformation simultaneously.

2. Nanoparticles are the fundamental building blocks for complex nano architectures. It is helpful to design nano-devices bottom-up when the electronic structures of individual components, such as nanopartilces, are well characterized. It is challenging to investigate the electronic structure without external perturbation, since the nanoparticles are typically suspended in solution phase environment. We combined aerosol techniques and a classic electronic structure instrument - Velocity Map Imaging spectroscopy together to investigate nanoparticles suspended in the vacuum. Using this novel apparatus, nanoparticle electronic structure and dynamics with no external perturbation can be unambiguously extracted from the photoelectron signal.
Primary Research Area
Physical/Analytical Chemistry
Interdisciplinary interests
Materials

Image Gallery


Photoelectron spectroscopy of nanoparticles

CO2 surface catalysts probed by HD 2D SFG

Selected Publications