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SUMMARY:Mechanisms limiting charge-carrier recombination and mobilities in
  metal halide perovskites (LACUS)
DTSTART:20170629T163000
DTEND:20170629T173000
DTSTAMP:20260916T165503Z
UID:367de574e8bdc56081b9c1504a41c8c0eb9b4ba5d2508314b8a59d4d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Laura Herz\nUniversity of Oxford\nUK\nThis presentation 
 first provides an overview of our recent work [1-7] elucidating the charge
 -carrier dynamics in organic-inorganic metal halide perovskites for solar 
 cells with power-conversion efficiencies now exceeding 20%. We discuss the
  fundamental photophysics that has enabled these materials to be such effi
 cient light-harvesters and charge collectors. We demonstrate how parameter
 s essential for photovoltaic operation are altered with substitutions of t
 he organic A cation (e.g. methyl ammonium\, formamidinium or caesium)\, th
 e metal M cation (e.g. Pb2+ or Sn2+) and the halide X anion (I- or Br-). W
 e further analyze distinct mechanisms that limit the charge-carrier recomb
 ination and mobility in these perovskites\, and their dependences on compo
 sition and temperature. We use these insights to predict charge-carrier di
 ffusion lengths and radiative efficiencies in the limit of ultra-low trap-
 related recombination\, which could potentially be reached through further
  advances in material processing. \n\n[1] L. M. Herz\, ACS Energy Lett.
 \, 2 (2017) DOI: 10.1021/acsenergylett.7b00276\n[2] W. Rehman\, D. P. 
 McMeekin\, J. B. Patel\, R. L. Milot\, M. B. Johnston\, H. J. Snaith\,
  and L. M. Herz\, Energy Environ. Sci.\, 10 (2017)\, pp. 361-369.\n[3] 
 D. P. McMeekin\, G. Sadoughi\, W. Rehman\, G. E. Eperon\, M. Saliba\,
  M. T. Hörantner\, A. Haghighirad\, N. Sakai\, L. Korte\, B. Rech\, 
 M. B. Johnston\, L. M. Herz\, and H. J. Snaith\, Science\, 351 (2016)\
 , pp. 151-155.\n[4] A. D. Wright\, C. Verdi\, R. L. Milot\, G. E. Epe
 ron\, M. A. Pérez-Osorio\, H. J. Snaith\, F. Giustino\, M. B. Johnsto
 n\, and L. M. Herz\, Nature Communications\, 7 (2016)\, p. 11755.\n[5] 
 M. B. Johnston and L. M. Herz\, Acc. Chem. Res.\, 49 (2016)\, p. 146
 –154.\n[6] W. Rehman\, R. L. Milot\, G. E. Eperon\, C. Wehrenfennig\
 , J. L. Boland\, H. J. Snaith\, M. B. Johnston\, and L. M. Herz\, Adv
 . Mater.\, 27 (2015)\, p. 7938–7944.\n[7] R. L. Milot\, G. E. Eperon\
 , H. J. Snaith\, M. B. Johnston\, and L. M. Herz\, Adv. Func. Mater.\,
  25 (2015)\, p. 6218.
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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