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SUMMARY:Quantifying mobile ions in perovskite-based devices with capacitan
 ce measurements
DTSTART:20191003T110000
DTEND:20191003T120000
DTSTAMP:20260406T111813Z
UID:645ff8cd3bc5d15a3045524e7c937a3952cba7cc8bddd186cf4e8fa5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Lucie McGovern and Moritz Futscher\, AMOLF\, The Netherlands\n
 Metal halide perovskites have proven to be a promising candidate for highl
 y-efficient solar cells and light-emitting diodes. However\, they are noto
 riously unstable. The main reason for this instability is the migration of
  mobile ions through the device during operation\, as they are mixed ionic
 -electronic conductors. The understanding of ion migration is crucial for 
 the fabrication of stable and efficient perovskite-based devices. We will 
 show how measuring the temperature-dependent capacitance in both the frequ
 ency and the time domain can be used to study ionic dynamics within perovs
 kite devices\, quantifying activation energy\, diffusion coefficient\, sig
 n of charge\, and concentration of mobile ions. Both A-site and B-site dop
 ing has shown positive effects on both the performance and the stability o
 f perovskite-based devices. However\, the origins of the increase in opera
 tional stability are not well understood. We will show how capacitance mea
 surements help to understand stability improvements using potassium-passiv
 ated perovskite solar cells and perovskite light-emitting diodes with mang
 anese substitution as examples.
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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