[CCoE Notice] Seminar * March 9, 2012 * Qing Yang * George Institute of Technology, Zhejiang University

[Lewis, Lindsay R]

 ***** Seminar *****
Center for Integrated Bio and Nano Systems
Houston Chapter of IEEE Nanotechnology Council and Houston Chapter of IEEE Magnetics Society
Friday, March 9, 2012
12:30 p.m. (Refreshments served at noon)
Room: W122 Building D3

Piezotronics and Piezo-phototronics: Principle and Its Applications in Flexible Optoelectronic and Renewable Energy

Qing Yang

School of Materials Science and Engineering
Georgia Institute of Technology, Atlanta, GA

Department of Optical Engineering
Zhejiang University, Hangzhou, China

Abstract:


The Due to the polarization of ions in a crystal that has non-central symmetry in materials such as the wurtzite structured ZnO, GaN and InN, a piezoelectric potential (piezopotential) is created in the crystal by applying a stress. Owing to the simultaneous possession of piezoelectricity, semiconducting and photonic properties, the piezopotential created in the crystal has a strong effect on the carrier transport at the interface/junction. By utilizing the advantages offered by these properties, new research fields have been created. Piezoelectric potential driven transient flow of electrons in external load is the fundamental physics of nanogenerator. Piezotronics is about the devices fabricated using the piezopotential as a "gate" voltage to tune/control charge carrier transport at a contact or junction, with applications in strain/force/pressure triggered/controlled electronic devices, sensors and logic units. The piezo-phototronic effect is to use the piezopotential to control the carrier generation, transport, separation and/or recombination for improving the performance of optoelectronic devices, such as photon detector, solar cell and LED. In the talk, we will introduce the fundamentals and review the updated progress of the three new fields. A perspective is given about their potential applications in sensors, human-silicon technology interfacing, MEMS, nanorobotics and renewable energy.



References:

1. Y. Liu, Q. Yang, Y. Zhang, Z. Yang, Z. L. Wang, "Nanowire Piezo-phototronic Photodetector: Theory and Experimental Design", Adv. Mater. DOI: 10.1002/adma.201104333

2. Q. Yang, W. Wang, S. Xu, Z. L. Wang, "Enhancing Light Emission of ZnO Microwire-Based Diodes by Piezo-Phototronic Effect", Nano Lett. 11 (2011) 4012.
3. Q.Yang, X. Guo, W. Wang, Y. Zhang, S. Xu, D. H. Lien, Z. L. Wang, "Enhancing Sensitivity of a Single ZnO Micro-/Nanowire Photodetector by Piezo-phototronic Effect", ACS Nano 4 (2010) 6285



BIOGRAPHY:

Dr. Qing Yang is an associate professor in the Department of Optical Engineering Zhejiang University, she is also a visiting scholar in the group of Prof. Z. L .Wang at George Tech from 2009-present. Dr. Yang obtained her Ph.D. in Materials Science and Engineering from Zhejiang University in 2006. Dr. Yang's research focuses on piezophotontronic properties, optoelectronic properties and devices of 1D micro-/nanomaterials. She has published more than 30 peer reviewed journal articles, holds 5 patents. Her recent work in piezopotentially enhanced performances of optoelectronic devices has formed the foundation of a new field called piezotronics and piezo-phototronics, which has potential applications in MEMS/NEMS, nanorobotics, human-electronics interface, sensors, medical diagnosis and photovoltaics.

Contact Prof. Jiming Bao (jbao at uh.edu<mailto:jbao at uh.edu>) if you would like to arrange for a time to meet with Prof. Qing Yang.
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