BEGIN:VCALENDAR
VERSION:2.0
PRODID:www.dresden-science-calendar.de
METHOD:PUBLISH
CALSCALE:GREGORIAN
X-MICROSOFT-CALSCALE:GREGORIAN
X-WR-TIMEZONE:Europe/Berlin
BEGIN:VTIMEZONE
TZID:Europe/Berlin
X-LIC-LOCATION:Europe/Berlin
BEGIN:DAYLIGHT
TZNAME:CEST
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
DTSTART:19810329T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=3;BYDAY=-1SU
END:DAYLIGHT
BEGIN:STANDARD
TZNAME:CET
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
DTSTART:19961027T030000
RRULE:FREQ=YEARLY;INTERVAL=1;BYMONTH=10;BYDAY=-1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:DSC-21669
DTSTART;TZID=Europe/Berlin:20250129T102000
SEQUENCE:1738132776
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250129T112000
URL:https://www.dresden-science-calendar.de/calendar/de/detail/21669
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Joseph: Impact of Device Degradation on the Energetic Landscape in 
 PM6:Y12 organic solar cells
CLASS:PUBLIC
DESCRIPTION:Speaker: Bekcy Joseph\nInstitute of Speaker: IFW Dresden\nTopic
 s:\n\n Location:\n  Name: IFW (A1E.10\, Hörsaal\, IFW Dresden)\n  Street:
  Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescripti
 on: Organic photovoltaic (OPV) devices have surpassed 19% power conversion
  efficiencies\, marking significant progress in their development. Despite
  these promising advances\, stability remains a major challenge that has t
 o be addressed before commercialization. These devices' fundamental proces
 ses\, such as charge generation\, recombination\, or transport\, depend on
  the organic materials' electronic structure and the energetic alignment w
 ith the other device layers. Hence\, understanding the impact of degradati
 on on the energetics of OPV devices is essential for improving their long-
 term performance. Ultraviolet photoemission spectroscopy (UPS) has been wi
 dely employed to investigate the electronic structure of organic materials
 \, but its surface sensitivity limits its application for the study of ene
 rgetics in the bulk and at buried interfaces of organic solar cells. Recen
 tly\, we have developed a novel spectroscopic approach – UPS depth profil
 ing – in which UPS is combined with argon cluster etching to enable the d
 irect probing of the energetic landscape of OPV devices.  In this study\, 
 UPS depth profiling was used to investigate the origin of the performance 
 loss of PM6:Y12 solar cells upon continuous illumination at 1 sun. Mapping
  the energetics in pristine and aged active layers revealed that the energ
 y levels of the active layer evolve upon aging\, resulting in a decrease i
 n the driving force for change separation. These studies were complemented
  by transient absorption spectroscopy measurements showing reduced charge 
 generation efficiency in aged devices. These studies provide new insights 
 into the degradation mechanisms of OPVs\, important for the future develop
 ment of mitigation strategies.
DTSTAMP:20260519T140727Z
CREATED:20250125T063908Z
LAST-MODIFIED:20250129T063936Z
END:VEVENT
END:VCALENDAR