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SUMMARY:Photophysical dynamics in (CH$_3$NH$_3$)PbX$_3$ (X=Br\, Cl) single
  crystal perovskites studied by Muon-Spin Spectroscopy
DTSTART;VALUE=DATE-TIME:20220830T160000Z
DTEND;VALUE=DATE-TIME:20220830T162000Z
DTSTAMP;VALUE=DATE-TIME:20220826T120912Z
UID:indico-contribution-3709@indico.stfc.ac.uk
DESCRIPTION:Speakers: Yasmine Sassa (Department of Physics\, Chalmers Univ
 ersity of Technology\, SE-41296 Göteborg\, Sweden)\nIn our efforts to hel
 p the earth recover from ecological burnout we have been trying to bridle 
 the sun’s energy since 1954\, when the first practical silicon solar cel
 l was introduced. Today we are researching for ever higher efficiencies\, 
 while we try to make use of earth-abundant materials. Perovskite solar cel
 ls are promising candidates for next generation photovoltaic technology du
 e to their energy gap tunability and significantly long carrier lifetime w
 hich leads to a high diffusion length.\nThis study focuses on ion diffusio
 n in (CH3NH3)PbX3 (X=Br\, Cl) hybrid perovskites\, structures that contain
  moving organic cations confined in a cage structure of PbX6 octahedra. Di
 ffusing ions can affect the local magnetic field distribution. We employ m
 uon spin spectroscopy (μ+SR) to exploit this effect by studying the relax
 ation of muon spin in local electronic and nuclear fields. Single crystals
  were studied in a 30-340 K temperature range with and without illuminatio
 n. We investigate the thermally activated regions\, compare the extracted 
 diffusion rate coefficients and activation energies. However\, the dynamic
 al structure and structural transitions of hybrid perovskites make theoret
 ical interpretations challenging. With μ+SR we are able to detect these s
 tructural changes and study their effect on the diffusive properties of th
 e crystals.\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3709/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3709/
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