BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Turkey BEGIN:DAYLIGHT DTSTART:20380119T061407 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=3TU;BYMONTH=1 TZNAME:+03 END:DAYLIGHT BEGIN:STANDARD DTSTART:20160907T000000 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=1WE;BYMONTH=9 TZNAME:+03 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20170506T151540Z UID:F3A7ED47-E5B6-11E7-833E-0050568D7F66 DTSTART;TZID=Turkey:20170505T133000 DTEND;TZID=Turkey:20170505T153000 DESCRIPTION:Speaker: Assoc. Prof. Hüsnü Emrah Ünalan\, Middle East Techn ical University\n\nTopic: "Transparent Contacts With Metal Nanowire Networ ks"\n\nLocation: Middle East Technical University\, Ankara\, Turkey\n\nAbs tract: Figure of merit transparency and sheet resistance values of the met al nanowire networks are very close\, if not better\, than those of commer cially available transparent and conducting thin films\, such as indium ti n oxide (ITO). In addition\, nanowire networks carry the prominent advanta ge of solution processability. In this presentation\, I will talk about ou r efforts on the utilization of silver (Ag) and copper (Cu) nanowire netwo rks as transparent contacts for polymeric light emitting diodes\, solar ce lls and transparent heaters. Following their synthesis and purification\, nanowires are deposited onto various substrates in the form of networks th rough spray coating. Surface roughness and long-term stability of the netw orks are carefully monitored\, where the latter is a particularly importan t problem for Cu nanowires. Infiltration of a conducting polymer decreased the roughness associated with the networks so that they can be used as an odes in polymeric light emitting diodes. In order to eliminate the shading losses associated with conventional screen-printed finger electrodes in s ingle crystalline silicon solar cells\, networks were utilized as top cont acts. Through the application of a post-deposition treatment for the forma tion of the ohmic contacts\, a relative enhancement in conversion efficien cy of 21% was obtained with respect to the reference cells. When used as t ransparent heaters\, reproducible heating characteristics and uniform temp erature distribution was obtained from the networks. The effect of nanowir e density on the temperature profile\, applied voltage as well as turn on/ off characteristics were investigated.\n\nBio: Emrah Unalan received the B S degree in Metallurgical and Materials Engineering from Middle East Techn ical University\, Turkey in 2002 and the MS and PhD degree in Materials Sc ience and Engineering at Rutgers University\, USA in 2004 and 2006\, respe ctively. From 2006 to 2008\, he was a Research Associate in Electrical Eng ineering Division in Engineering Department at University of Cambridge\, U K. In 2008\, he joined Department of Metallurgical and Materials Engineeri ng\, Middle East Technical University\, where he is currently an Associate Professor. His research interests include synthesis of nanotubes/nanowire s and their utilization in flexible\, transparent\, stretchable and textil e integrated electronics and energy harvesting devices. The aim of his res earch is not only the utilization of nanomaterials for unforeseen applicat ions through the fabrication of novel devices but also seeking possibiliti es for new device concepts and form factors. He is a member of Materials R esearch Society (MRS)\, American Chemical Society (ACS) and a recipient of the Turkish Academy of Sciences Young Scientist Award in 2009\, The Scien tific and Technological Research Council of Turkey (TUBITAK) Incentive Awa rd in 2014\, Science Academy Young Scientist Award in 2015.\n\nSpeaker(s): Assoc. Prof. Husnu Emrah Unalan\, \n\nAnkara\, Ankara\, Türkiye LOCATION:Ankara\, Ankara\, Türkiye ORGANIZER:ozergul@metu.edu.tr SEQUENCE:0 SUMMARY:[Legacy Report] IEEE AP/MTT/EMC/ED TURKEY CHAPTER SEMINAR SERIES -- SEMINAR 10 URL;VALUE=URI:https://events.vtools.ieee.org/m/148627 X-ALT-DESC:Description: <br /><p>Speaker: Assoc. Prof. H&uuml\;sn&uuml\; Em rah &Uuml\;nalan\,&nbsp\;Middle East Technical University</p>\n<p>Topic: " Transparent Contacts With Metal Nanowire Networks"</p>\n<p>Location: Middl e East Technical University\, Ankara\, Turkey</p>\n<p><em>Abstract: Figure of merit transparency and sheet resistance values of the metal nanowire n etworks are very close\, if not better\, than those of commercially availa ble transparent and conducting thin films\, such as indium tin oxide (ITO) . In addition\, nanowire networks carry the prominent advantage of solutio n processability. In this presentation\, I will talk about our efforts on the utilization of silver (Ag) and copper (Cu) nanowire networks as transp arent contacts for polymeric light emitting diodes\, solar cells and trans parent heaters. Following their synthesis and purification\, nanowires are deposited onto various substrates in the form of networks through spray c oating. Surface roughness and long-term stability of the networks are care fully monitored\, where the latter is a particularly important problem for Cu nanowires. Infiltration of a conducting polymer decreased the roughnes s associated with the networks so that they can be used as anodes in polym eric light emitting diodes. In order to eliminate the shading losses assoc iated with conventional screen-printed finger electrodes in single crystal line silicon solar cells\, networks were utilized as top contacts. Through the application of a post-deposition treatment for the formation of the o hmic contacts\, a relative enhancement in conversion efficiency of 21% was obtained with respect to the reference cells. When used as transparent he aters\, reproducible heating characteristics and uniform temperature distr ibution was obtained from the networks. The effect of nanowire density on the temperature profile\, applied voltage as well as turn on/off character istics were investigated.</em></p>\n<p><em>Bio:&nbsp\;Emrah Unalan receive d the BS degree in Metallurgical and Materials Engineering from Middle Eas t Technical University\, Turkey in 2002 and the MS and PhD degree in Mater ials Science and Engineering at Rutgers University\, USA in 2004 and 2006\ , respectively. From 2006 to 2008\, he was a Research Associate in Electri cal Engineering Division in Engineering Department at University of Cambri dge\, UK. In 2008\, he joined Department of Metallurgical and Materials En gineering\, Middle East Technical University\, where he is currently an As sociate Professor. His research interests include synthesis of nanotubes/n anowires and their utilization in flexible\, transparent\, stretchable and textile integrated electronics and energy harvesting devices. The aim of his research is not only the utilization of nanomaterials for unforeseen a pplications through the fabrication of novel devices but also seeking poss ibilities for new device concepts and form factors. He is a member of Mate rials Research Society (MRS)\, American Chemical Society (ACS) and a recip ient of the Turkish Academy of Sciences Young Scientist Award in 2009\, Th e Scientific and Technological Research Council of Turkey (TUBITAK) Incent ive Award in 2014\, Science Academy Young Scientist Award in 2015.</em></p > END:VEVENT END:VCALENDAR