<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:SimSun;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Consolas;
panose-1:2 11 6 9 2 2 4 3 2 4;}
@font-face
{font-family:"\@SimSun";}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.5pt;
font-family:Consolas;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:SimSun;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:Consolas;}
span.apple-style-span
{mso-style-name:apple-style-span;}
span.EmailStyle22
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle23
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle24
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div><div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal align=center style='text-align:center'><span class=apple-style-span><span style='font-family:"Calibri","sans-serif"'> </span><span style='color:#1F497D'>***** Seminar *****</span></span><o:p></o:p></p><div><div><p class=MsoNormal align=center style='text-align:center'><b><span style='color:#1F497D'>Center for Integrated Bio and Nano Systems</span></b><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal align=center style='text-align:center'><b><span style='color:#1F497D'>Houston Chapter of IEEE Nanotechnology Council and Houston Chapter of IEEE Magnetics Society</span></b><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal align=center style='text-align:center'><span style='color:#1F497D'>Friday, March 9, 2012</span><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal align=center style='text-align:center'><span style='color:#1F497D'>12:30 p.m. (Refreshments served at noon)</span><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal align=center style='text-align:center'><span style='color:#1F497D'>Room: W122 Building D3</span><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p></div></div><p class=MsoNormal><span class=apple-style-span><span style='font-size:11.5pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></span></p><div><div><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:24.0pt;color:#336699'>Piezotronics and Piezo-phototronics: Principle and Its Applications in Flexible Optoelectronic and Renewable Energy</span></b><span style='font-size:24.0pt;color:#336699'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:24.0pt;color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:18.0pt'>Qing Yang<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:18.0pt;font-family:"Calibri","sans-serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><i><span style='font-size:16.0pt'>School of Materials Science and Engineering <o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center'><i><span style='font-size:16.0pt'>Georgia Institute of Technology, Atlanta, GA<o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center'><i><span style='font-size:16.0pt'> <o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center'><i><span style='font-size:16.0pt'>Department of Optical Engineering<o:p></o:p></span></i></p><p class=MsoNormal align=center style='text-align:center'><i><span style='font-size:16.0pt'>Zhejiang University, Hangzhou, China <o:p></o:p></span></i></p></div></div></div></div></div></div></div></div></div></div></div><div><div><div><div><div><div><div><div><div><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'>Abstract:<o:p></o:p></span></p><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'>The </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>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.<o:p></o:p></span></p><p style='margin-top:0in;text-align:justify'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p><p style='margin-top:3.15pt;text-align:justify'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>References:<o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt;text-align:justify'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>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<o:p></o:p></span></p><p style='margin:0in;margin-bottom:.0001pt;text-align:justify'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>2. Q. Yang, W. Wang, S. Xu, Z. L. Wang, “Enhancing Light Emission of ZnO Microwire-Based Diodes by Piezo-Phototronic Effect”, Nano Lett. <b>11</b> (2011) 4012.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>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 <b>4</b> (2010) 6285 <o:p></o:p></span></p><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'><o:p> </o:p></span></p></div></div></div></div></div></div></div></div></div></div></div></div></div><div><div><div><div><div><div><p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'>BIOGRAPHY:<o:p></o:p></span></p><p style='margin-top:3.15pt;text-align:justify'><span style='font-family:"Times New Roman","serif"'>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.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'>Contact Prof. Jiming Bao (<a href="mailto:jbao@uh.edu"><span style='color:#244061'>jbao@uh.edu</span></a>) if you would like to arrange for a time to meet with Prof. </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Qing Yang</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061'>.<o:p></o:p></span></p></div></div></div></div></div></div></div></body></html>