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<div><span style="font-size:10.5pt; font-family:"Arial","sans-serif"; color:#1F497D"> ***** Seminar *****</span><span style="color:#1F497D"></span></div>
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<b><span style="font-size:16.0pt; color:#1F497D">Department of Electrical and Computer Engineering</span></b><span style="font-size:16.0pt; color:#1F497D"></span></p>
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<b><span style="font-size:16.0pt; color:#1F497D">Materials Engineering Program</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Center for Integrated Bio and Nano Systems</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D"> 10:00 a.m., August 27</span></b><b><span style="font-size:14.0pt; color:#1F497D">, 2021</span></b><span style="font-size:14.0pt; color:#1F497D"></span></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Join Zoom Meeting</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:#1F497D"></span></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Meeting ID: 845 619 943</span></b></p>
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<b><span style="font-size:14.0pt; color:#1F497D">Password: 016104 </span></b></p>
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<b><span style="font-size:20.0pt; color:#1F497D"></span></b><b><span style="font-size:20.0pt; color:#1F497D">Dynamic Semiconductor Junctions Based Electric Generators <br>
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<b><span style="font-size:18.0pt; color:#1F497D">Qing Zhang</span></b></p>
<div align="center" style="text-align:center"><span style="font-size:18.0pt; color:#1F497D"></span><span style="font-size:16.0pt; color:#1F497D"></span><span style="font-size:16pt; color:rgb(0,36,81)"></span><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(0,36,81)">IEEE
Nanotechnology Council Distinguished Lecturer<br>
</span></div>
<div align="center" style="text-align:center"><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(0,36,81)">School of Electrical and Electronic Engineering<br>
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<div align="center" style="text-align:center"><span style="font-family:"Times New Roman",Times,serif; font-size:16pt; color:rgb(0,36,81)">Nanyang Technological University
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<b><span style="color:rgb(12,100,192)">Abstract</span></b><span style="font-size:11pt; font-family:"Calibri","sans-serif"; color:rgb(12,100,192)">:</span><span style="color:rgb(12,100,192)">
</span><span style="color:#1F497D"><span style="font-size:12pt; font-family:"Times New Roman",serif; color:rgb(12,100,192)">In this talk, I shall discuss mechanical to electric power conversion through dynamic semiconductor junctions formed with a pair of semiconducting
or/and metallic electrodes which possess distinct chemical potentials. When the two electrodes are brought in contact, electrons could diffuse from the high into the low chemical potential electrode. Once the two electrodes are being separated, the diffused
electrons are then discharged to the external circuit and flow back to the high chemical potential electrode, converting the mechanical power to electrical power. In addition, a direct current is generated in the direction of the built-in electric field in
the dynamic p-n junction across the contacted surfaces if one electrode is slid on the other, flowing from the p-semiconductor through the external circuit to the n-semiconductor. The generated currents and voltages are studied through sliding speeds, accelerations,
contacting forces, operation temperatures and the geometries of the top electrode. The direct current generation can be attributed to electron-hole pairs generated at the two sliding surfaces, which are then swept out the dynamic junction by the built-in electric
field. (Acknowledg-ements: This project is financially supported by MOE AcRF Tier1 (2018-T1-005-001), MOE AcRF Tier2 (2018-T2-2-005) and A*STAR AME IRG Grant SERC A1983c0027, Singapore.)</span></span><span style="color:#1F497D"></span>
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<b><span style="color:rgb(12,100,192)">Short Bio</span></b><span style="color:rgb(12,100,192)">:</span><span lang="EN-SG" style="font-size:12.0pt; font-family:"Times New Roman",serif"></span><span style="color:rgb(12,100,192)"> Qing Zhang is a Professor at
Centre of Micro-/Nano-electronics, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. His main research interests cover the electronic properties and applications of carbon-based materials and other low dimensional
electronic materials, energy storage devices and energy harvesting devices, etc. </span><span style="color:#1F497D"><br>
<span style="color:rgb(12,100,192)">Prof Qing Zhang and his team were one of the early groups who studied electron and heat transport in carbon nanotubes (CNTs). They found that heat transport in the CNTs is dominated by phonons, rather than electron transport.
They have been studying the influences of metal/CNT contacts, adsorbed molecules and functional chemical agents on electron transport in CNTs since 1998 and have successfully demonstrated a variety of CNT electronic devices, including CNT logic gates, CNT
OLED drivers, CNT flexible logic gates, CNT bio/chemical sensors, optical configurable CNT and ITO complementary logic gates, etc. They have made a significant contribution to enhance the stability of high specific capacity of carbon-based anodes for Li-ion
batteries. In 2014, they demonstrated high performance flexible Li-ion batteries with flexible coaxial Ni/PVDF nanofiber network and carbon fiber network. In 2017, Prof Zhang and his team successfully developed a unique electric generator with intermittently
contacted p- and n-type doped semiconductor as the electrodes, in which both conduction and displacement current are generated. This is the first generator that possesses this characteristic.</span></span><span style="color:rgb(12,100,192)">
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<span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif">Please contact Dr.
</span><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif"></span><span style="color:rgb(23,78,134); font-size:11pt; font-family:"Times New Roman",Times,serif"><span style="font-size:11.0pt; color:#1F4E79"><a href="mailto:yyao4@uh.edu" target="_blank" rel="noopener noreferrer"><span></span></a></span>Jiming
Bao (jbao@uh.edu) if you want to meet with the speaker.</span></div>
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