BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Interface engineering and physics therein for high efficient and s
 table perovskite solar cells
DTSTART:20180308T103000
DTEND:20180308T113000
DTSTAMP:20260407T091612Z
UID:e52639e02b278837118f35cc03902790c05b15d00ea213e54d3a50b1
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Giulia Grancini\nGroup for Molecular Engineering of Functi
 onal Materials\nEPFL Valais\, Sion\nChE-605 - Highlights in Energy Researc
 h seminar series\nNew photovoltaic (PV) technologies\, delivering high per
 formances at low price\, are ideal candidates to sustain the actual paradi
 gm shift towards a carbon-free economy. In this context\, Perovskite Solar
  Cells (PSCs)\, pioneered by methylammonium lead-iodide (CH3NH3PbI3) perov
 skite\, are leading the photovoltaic scenario\, showing impressive power c
 onversion efficiency beyond 22% reached upon only six years of research.[1
 ] PSCs consist of a layered device where the perovskite is sandwiched betw
 een an electron transport layer (i. e. mesoporous titanium oxide)\, and an
  organic hole transporter.[2] Light is absorbed by the perovskite\, free c
 arriers are generated and injected into the selective contacts. High perfo
 rmances have been obtained by fine-tuning the perovskite composition and b
 y engineering the device interfaces. However\, poor device stability (=sho
 rt lifetime) mainly due to water-induced degradation\, is the actual chall
 enge.\n\nI will present our innovative approach to realize efficient and s
 table devices by controlling the fundamental photophysical processes\, suc
 h as charge injection\, trapping\, charge recombination\, (happening over 
 timescales form femtoseconds to nanoseconds)\, at the device interfaces an
 d manipulating them to create new  functionalities. To this regard\, we p
 ropose a new multidimensional PSC by designing new hydrophobic compounds -
  to reduce the water induced degradation - and by engineering stable multi
 dimensional interfaces. The multi-dimensional PSC deliver high efficiency 
 (over 20%) and a record stability value of 11\,000 hours\, corresponding t
 o more than one year operation\, with zero efficiency losses. [2]\nReferen
 ces:\n[1] http://www.nrel.gov/ncpv/images/efficiency_chart.jpg\, “Nation
 al Renewable Energy Laboratory Best Research-Cell Efficiencies”.\n[2] G.
  Grancini et al. “One-Year stable perovskite solar cells by 2D/3D interf
 ace engineering” Nat. Comm. 8 (15684)\, (2017)\n 
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR