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Dr. Yuhang Ren

Office Address:
695 Park Avenue, Room 1204 HN
New York, NY 10065

Phone: 212 772-5258
Fax: 212 772-5390
Email: yre@hunter.cuny.edu


Office Hours for Spring 2020:  Tu, Thur. 1-2 PM



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. 

 The Material Fabrication & Ultrafast Optics Group


 

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 CuInSnanoparticles", Chivin Sun, Zehra Cevher, Jin Zhang, Bo Gao, Kai Shum, and Yuhang Ren, J. Mater. Chem. A, 2, 10629 (2014).

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