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SUMMARY:Metal Halide Perovskites at the Nanoscale: high quality optoelectr
 onic materials with unique functionality and distinctions from thin film p
 erovskites.
DTSTART:20191003T110000
DTEND:20191003T120000
DTSTAMP:20260917T070547Z
UID:14597dfa2dca82ee03f2e43c7ecac0bf66b6e31f56d7e79b82516100
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Joseph M. Luther\nNational Renewable Energy Laboratory\,\n
 Golden\, Colorado\, USA\nThe rediscovered metal halide perovskite semicond
 uctor system has the potential to be extremely transformative for all opto
 electronic devices\, especially photovoltaics (PVs). Perovskites show a un
 ique tolerance to crystalline defects that cause trouble in most other sem
 iconductors. Therefore the potential offered is that very high efficiency 
 PVs can be fabricated in extremely fast and inexpensive ways\, thus offeri
 ng a revolution for the solar industry and a direct route toward producing
  the world’s energy with a simple and clean technology.  Long-term dura
 bility of the devices is the critical remaining challenge to be solved. Tw
 o examples of major instabilities in device performance are the volatility
  of the organic cation and the specific crystal habit in which the materia
 l embodies.\nNanoscale versions (often termed quantum dots (QDs)) of the a
 ll-inorganic metal halide perovskite (CsPbI3) tend to retain the desired p
 erovskite phase due to strain effects at the surface of the QDs whereas co
 nventional films of the same material “relax” to an orthorhombic non-p
 erovskite structure at room temperature. Therefore\, these QDs potentially
  solve both of the instability issues. This customizable new nanomaterial 
 system has incredible potential for many applications in optoelectronics\,
  including photovoltaics\, LEDs\, displays and lasers. This talk will cove
 r several related projects that describe:\n1) the phase stability of all-i
 norganic perovskite QDs\n2) surface treatments to manipulate transport in 
 perovskite QD arrays\n3) cation exchange-based synthesis of homogeneous al
 loyed QDs\n4) our latest work in QD solar cell device architectures\n5) do
 ping of perovskite QD films for manipulating electronic properties (enhanc
 ed mobility).\n\nThe seminar can also be followed either from an equipped 
 room with visio-connection in EPFL Lausanne or with a computer with Jabber
 guest but you are kindly requested to contact our IT support 1 day befo
 re (37679 - it.vs@epfl.ch). \n\n 
LOCATION:Tseuzier\, I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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