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SUMMARY:Charge carrier recombination and electronic trap states in perovsk
 ite solar cells 
DTSTART:20160204T100000
DTEND:20160204T113000
DTSTAMP:20260610T042430Z
UID:2823c19df50923068e3f66058161f57c89de59591a4b9d6cf14322d6
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Dr. Vladimir Dyakonov\nPerovskite solar cells represents
  a very promising thin-film PV technology with an impressive increase in p
 ower conversion efficiency within the last few years already competing wit
 h inorganic thin film technologies. However\, a fundamental understanding 
 of the working principle of this kind of solar cell material is still lack
 ing. An anomalous hysteresis behavior in the current-voltage characteristi
 cs is often reported in perovskite solar cells as well as polarization eff
 ects possibly related to the perovskite crystals.  Using several electric
 al and optical complementary experimental techniques\, our main aim is to 
 bring more light into the fundamental processes of perovskite solar cells.
   Transient electrical studies such as the open circuit voltage decay com
 bined with the small perturbation signal experiment of transient photovolt
 age and charge extraction allows us to look into the charge carrier recomb
 ination dynamics. These dynamics detected in complete solar cell devices c
 an be put in relation to the radiative recombination dynamics of transient
  luminescence as well as to steady state measurements of the absolute lumi
 nescence yield. The charge carrier dynamics in perovskite solar cells is i
 nfluenced by the amount of dopants as well as defects caused by vacancies 
 or interstitials in the crystal. For analysis of such defect levels we app
 ly the experimental technique of thermally stimulated current (TSC) allowi
 ng us to estimate both defect concentration and the energetic depth of the
  defects related to the conduction and valence band.
LOCATION:EPFL VALAIS Zeuzier room I17 4 K2 http://plan.epfl.ch/?lang=en&ro
 om=I17+4+K2
STATUS:CONFIRMED
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