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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 Fall 2017:  

Tu, Fri. 1-2 PM

 

 

Ren2

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 2017

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

Ph.D in Laser & Optics (and Surface & Interface), Applied Science Dep. May 09, 2003 

 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 Dep. May 26, 1999  

 Zhejiang University, China 
 Thesis: 
Confined Polaron in Low-dimensional Semiconductor Heterojunctions ( Honored 


RECENT PUBLICATIONS 

1.Optimization of the defects and the nonradiative lifetime of GaAs/AlGaAs double heterostructures”,Z. Cevher, P. A. Folkes, H. S. Hier, B. L. VanMil, B. C. Connelly, W. A. Beck, and Y. H. Ren, Journal of Applied Physics, 123, 161512 (2018). 

2. “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).

3. “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).

4.  “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).

5. "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).

6. "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). 

8. “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). 

9. “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).

10. "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).

  11. "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).

 12. "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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