ABOUT
Yuhang Ren is a tenured full Professor of Physics and Astronomy
at Hunter College and Graduate Center of the City University of New York. Dr. Ren received a B.Sc. with Honors in Physics in 1995 from
the Zhejiang Normal University, a Ph.D. with Honors in Condensed Matter Physics
from the Zhejiang University in 1999, and a Ph.D. in Applied Science from the
College of William and Mary in 2003. He was Department Chair of Physics and Astronomy and President of Procedure Committee at Hunter
College between 2010 and 2014. Dr. Ren has authored/co-authored over 100 papers in
Condensed Matter Physics and Ultrafast Laser Spectroscopy and he holds over 120 patents in solar thin film materials
and applications. He received an ACS-PRF Award in 2006, a NYSTAR Award in 2011,
a NY Powerbridge Award in 2017 and IF Gold Award in 2019.
RESEARCH INTERESTS & ACTIVITIES
Dr. Ren is working on the nonlinear optical characterization
of materials germane to the breakdown, or other failure, modes associated with
thermal degradation, electromechanical processes in prototypical dielectrics
and new developed ferroelectrics. For these studies, he has developed advanced nonlinear optical techniques including SHG microscopy and
time-resolved two color pump-probe spectroscopy to image and understand in-situ
coupled breakdown processes around interfaces and bulk boundaries that are
difficult to obtain through other methods. Both techniques have been adapted to
dielectric and ferroelectric samples, including BaTiO3 and SrTiO3 to study ionic defect electromigration, space charge
accumulation, ionic degradation, and electrical and thermal breakdown near
grain boundaries and interfaces.
Most recently, Dr. Ren has developed a nanometer-resolution, ultrafast laser acoustic technique to image nano scale structural defects and ferroelectric domain boundaries for optimization of high performance energy storage devices. The time-resolved spectroscopic measurements will allow him to investigate local phenomena such as those occurring at grain boundaries that determine the overall conversion efficiency of solar cells. The focus of Dr. Ren's research is also to create new ideas for generating a robust prototype fabrication process for low-cost thin film solar cells and energy storage devices in terms of reliability, uniformity, and conversion efficiency.
CLASSES (Taught Between 2005 and 2020)
Physics 100, 111, 120, 121, 230, 235, 330, 334, 445/645
EDUCATION HISTORY
Postdoctoral Research Fellow: Oct. 2003 -Sept. 2005, at the University of Michigan, Ann Arbor, MI (with Professor Roberto Merlin)
Ph. D. in Laser & Optics (and Surface & Interface), Applied Science Department, May 09, 2003 (with Professor Gunter Luepke)
College of William & Mary, USA
Thesis: Time-Resolved Optical Studies of Colossal Magneto-Resistance and Charge- Density Wave Materials
Ph. D. in Condensed Matter Physics, Physics Department, May 26, 1999 (with Professors Qirui Zhang and Zhengkuan Jiao)
Zhejiang University, China
Thesis: Confined Polaron in Low-dimensional Semiconductor Heterojunctions ( Honored )
B. Sc. in Physics, Physics Department, 1995 (Honored), Zhejiang Normal University, China
RECENT PUBLICATIONS
1. “Engineering nanoscale polarization at the SrTiO3/Ge
interface”, T. Le, O. Kurt, J. Ouyang, J. J. Wang, L. Q. Chen, E. L. Lin, J. G.
Ekerdt, and Y. H. Ren*, Scripta Materialia 178, 489-492 (2020).
2. “Strain Engineering of Dischargeable Energy Density of
Ferroelectric Thin-Film Capacitors”, J. J. Wang, Y. J. Su, B. Wang, J. Ouyang,
Y. H. Ren, and L. Q. Chen, Nano Energy, 72, 104665 (2020).
3. “Local
structural changes due to the electric field‐induced migration of oxygen vacancies at Fe‐doped
SrTiO3 interfaces”, David
Ascienzo, Onur Kurt, Steve Greenbaum, Thorsten J. M. Bayer, Maier Russell,
Jianjun Wang, Clive A. Randall, and Yuhang Ren*, Journal of the American
Ceramic Society, 102, 4353-4366 (2019).
4. “Analysis of ferroelectric nanostructures—spectroscopic
methods/second harmonic generation polarimetry”, Y. H. Ren, Nanostructures in
Ferroelectric Films for Energy Applications, 339-357 (2019).
5. “Detection of Nanoscale Structural Defects in Degraded
Fe-Doped SrTiO3 by Ultrafast Photoacoustic Waves”, Y. Zhang, O. Kurt, D.
Ascienzo, Q. Yang, T. Le, S. G. Greenbaum, T. J. M. Bayer, C. A. Randall, Y. H.
Ren*, The Journal of Physical Chemistry C, 122, 12864 (2018).
6. “Optimization of the defects and nonradiative lifetime of
undoped GaAs/AlGaAs double heterostructures”, Z. Cevher, P. Folkes, H. Hier, B.
VanMil, B. C. Connelly, W. Beck, and Y. H. Ren*, Journal of Applied Physics
123, 161512 (2018).
7. “Formation
of structural defects and strain in electrodegraded Fe‐doped SrTiO3 crystals due to oxygen
vacancy migration”, D.
Ascienzo, O. Kurt, S. Greenbaum, T. J. M Bayer, R. A Maier, C. A. Randall, Y.
H. Ren*, Journal of the American Ceramic Society, 101, 2545 (2018).
8. “Demonstration of ultra-high recyclable energy densities in
domain-engineered ferroelectric films”, H. B. Cheng, J. Ouyang*, Y. X. Zhang, D.
Ascienzo, Y. Li, Y. Y. Zhao and Y. H. Ren*, Nature Communications, 8, 1999 (2017).
9. “Nonlinear optical detections of structural distortions at degraded
Fe-doped SrTiO3 interfaces” O. Kurt, D. Ascienzo, S. Greenbaum, T. J. M. Bayer, C. A. Randall, N. Madamopoulos, Y. H.
Ren*, Materials Chemistry and Physics, 198, 131 (2017).
10. “Experimental demonstration of 55-fs spin canting in photoexcited iron
nanoarrays”, Yuhang Ren*, Wei Lai, Zehra Cevher, Yu Gong, and G. P. Zhang,
Applied Physics Letters, 110, 082404
(2017).
11. "Probing electrocolored Fe-doped SrTiO3 bulks using optical
second harmonic generation”, D. Ascienzo, S, Greenbaum, T.J.M. Bayer, C. A.
Randall, Y. H. Ren*, Acta Materialia, 126,
520 (2017).
12. "Printable and flexible phototransistors based on blend of organic
semiconductor and biopolymer”, J. Huang, J. Du, Z. Cevher, Y. H. Ren, X. Wu, Y.
Chu, Advanced Functional Materials, 27, 1604163 (2017).
13. “Investigation of electric field–induced structural changes at Fe-doped
SrTiO3 anode interfaces by second harmonic generation”, D. Ascienzo,
H. Yuan, S. Greenbaum, T.J.M. Bayer, R. A. Maier, J. J. Wang, E. C. Dickey, H.
B. Zhao, and Y. H. Ren*, Materials 9,
883 (2016).
14. “Observation of structural inhomogeneity at degraded Fe-doped SrTiO3
interfaces”, D. Ascienzo, S. Greenbaum, T.J.M. Bayer, R. Maier, C. A. Randall,
Y. H. Ren*, Applied Physics Letters 109,
031602 (2016).
15. "Energy barrier at the N719-dye/CsSnI3 iterface for photogenerated holesin dye-sensitized solar cells", Jin Zhang, Chunhui Yu, Lili Wang, Yizhi Li, Yuhang Ren, Kai Shum, Scientific Reports, 4, 6954 (2014).
16. "Ultrafast optical detection of magnetic inhomogeneity in ferromagnetic La0.67Ca0.33MnO3", Y. Gong, Z. Zhang, D. Ascienzo, Y. Abranyos, H. B. Zhao, G. Lupke, Qi Li, Y. H. Ren, Europhysics Letters, 108, 17010 (2014).
17. "One-pot synthesis and characterization of chalcopyrite CuInS2 nanoparticles", Chivin Sun, Zehra Cevher, Jin Zhang, Bo Gao, Kai Shum, and Yuhang Ren, J. Mater. Chem. A, 2, 10629 (2014).
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Prof. Mark Hillery organizes artificial intelligence and New York Quantum Day 2 workshop
