BEGIN:VCALENDAR VERSION:2.0 METHOD:PUBLISH PRODID:-//Missouri State University/Calendar of Events//EN CALSCALE:GREGORIAN X-WR-TIMEZONE:America/Chicago BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:3b86569b-ec54-40b8-b84d-76c745c551bd.215641@calendar.missouristate.edu CREATED:20210217T231626Z LAST-MODIFIED:20210217T231626Z LOCATION: SUMMARY:PAMS Seminar: "In Situ Transient Absorption Spectroscopy During Ma terials Formation" by Dr. Cathy Wong DESCRIPTION:Dr. Cathy WongDepartment of Chemistry and BiochemistryUniversi ty of Oregon\n\n\nAbstract:Molecules\, polymers\, and nanocrystals can fo rm the active layer in electronic devices such as photovoltaics and light -emitting diodes. Their electronic structure and excited state dynamics d ictate their function and suitability for these applications. Transient a bsorption (TA) spectroscopy is used to measure these properties\, and has provided remarkable insights into the behavior and function of electroni c materials. However\, multiple minutes-to-hours are typically required t o perform these measurements\, making it difficult to accurately measure the excited state dynamics of unstable and evolving materials systems suc h as electronic materials during their synthesis or deposition into a thi n film. In this seminar\, I will introduce a novel implementation of TA s pectroscopy that can measure transient spectra in 8 ms\, with good signal -to-noise achieved in ~30 s. This new technique is applied to the study o f organic molecules during their aggregation into a thin film\, as well a s lead-halide perovskite nanocrystals during their synthesis. These examp les demonstrate that in addition to providing an understanding of how exc ited state dynamics change during materials formation\, TA signals measur ed in situ can reveal new insights into the mechanisms of complex materia ls formation processes.\n\n\nThis seminar will be held exclusively on Zoo m (955 5209 1021). Please visit the Physics Seminars page for a link. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p>Dr . Cathy Wong<br>Department of Chemistry and Biochemistry<br>University of Oregon</p>\n<p>Abstract:<br>Molecules\, polymers\, and nanocrystals can form the active layer in electronic devices such as photovoltaics and lig ht-emitting diodes. Their electronic structure and excited state dynamics dictate their function and suitability for these applications. Transient absorption (TA) spectroscopy is used to measure these properties\, and h as provided remarkable insights into the behavior and function of electro nic materials. However\, multiple minutes-to-hours are typically required to perform these measurements\, making it difficult to accurately measur e the excited state dynamics of unstable and evolving materials systems s uch as electronic materials during their synthesis or deposition into a t hin film. In this seminar\, I will introduce a novel implementation of TA spectroscopy that can measure transient spectra in 8 ms\, with good sign al-to-noise achieved in ~30 s. This new technique is applied to the study of organic molecules during their aggregation into a thin film\, as well as lead-halide perovskite nanocrystals during their synthesis. These exa mples demonstrate that in addition to providing an understanding of how e xcited state dynamics change during materials formation\, TA signals meas ured in situ can reveal new insights into the mechanisms of complex mater ials formation processes.</p>\n<p>This seminar will be held exclusively o n Zoom (955 5209 1021). Please visit the&nbsp\;<a href="https://physics.m issouristate.edu/seminars.htm">Physics Seminars page</a> for a link.</p>< /body></html> DTSTART;TZID=America/Chicago:20210225T160000 DTEND;TZID=America/Chicago:20210225T170000 SEQUENCE:0 URL:https://physics.missouristate.edu/seminars.htm CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff END:VEVENT END:VCALENDAR