The XYZ Lab at Columbia University

Light-matter interaction, solar energy conversion, ultrafast spectroscopy

Group members | Publications

Research highlights

We are interested in the general problem of light-condensed matter interaction. A main research thrust is to establish new photophysical mechanisms that may be utilized to revolutionize solar energy conversion or light emission. As examples, recent discoveries in our lab showed how an electron and a hole is bound by the Coulomb potential across an organic semiconductor interface, how an exciton can split into two via the singlet fission process, and how hybrid semiconductors can yield the highest possible quantum efficiency in light emission.

Our group is part of the NSF Materials Research Science and Engineeting Center (MRSEC), Center for Precision Assembly of Superstratic and Superatomic Solids.

perovskite nanowire lasers

time resolved SHG

NOPA lasers
Hybrid semiconductor for efficient light absorption/emission

Science, 353, 1409 (2016)
Nature Mater.
14, 636 (2015)

Perspective in Science and News.

Singlet fission in organic semiconductors

Nature Chem. 4 , 840 (2012).
334, 1541 (2011).

Hot carrier & manybody interaction in  quantum confined semiconductors:

Nano Lett. 13 , 6091 (2013).
328, 1543 (2010).

Charge transfer excitons at van der Waals interfaces:

Nature Mater. 12, 66 (2013).
Phys. Rev. Lett. 114,
247003 (2015).

XYZ Lab News

5/7/2015: Congratulations to Xiaoxi Wu, who successfully defended her PhD thesis on the Photophysics of Perovskites.

6/23/2015: Congratulations to Cory Nelson, who successfully defended his PhD thesis on Nonlinear Spectroscopy of Interfaces.

8/11/2015: Congratulations to Nick Monahan, who successfully defended his PhD thesis on Ultrafast Exciton Dynamics at Molecular Surfaces.

10/1/2015: Congratulations to Jue Wang for winning the Traube Fellowship for "Outstanding talent in photochemistry".

5/5/2016: XYZ and Greg Scholes held the second joint group symposium at Princeton.

6/1/2016. Dr. Fang Liu joined the group as a postdoc. Fang came to us from UPenn.

6/13/2016: Congratulations to Haiming Zhu for winning the Sturge Prize. Haiming will join the faculty of Zhejiang University on July 1st as part of the "One-Thousand Talents" program in China.