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SUMMARY:Understanding energetics of organic-organic interfaces and mixture
 s
DTSTART:20161117T163000
DTEND:20161117T173000
DTSTAMP:20260506T020320Z
UID:518c45ae3dfb3cc5a5be66dce286afa90f4df6fc3ddf088f3190f1fc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Denis Andrienko\nMax Planck Institute for Polymer Research
 \nWe will discuss the role of mesoscale order\, electrostatic effects\, de
 fects\, and roughness for charge splitting and detrapping at donor-accepto
 r interfaces. We will show how inclusion of mesoscale order resolves the c
 ontroversy between experimental and theoretical results for the energy-lev
 el profile and alignment in a variety of photovoltaic systems\, with direc
 t experimental validation. We predict open-circuit voltages of planar hete
 rojunction solar cells in excellent agreement with experimental data\, bas
 ed only on crystal structures and interfacial orientation. We show how lon
 g-range molecular order and interfacial mixing generate homogeneous electr
 ostatic forces that can drive charge separation and prevent minority carri
 er trapping across a donor-acceptor interphase. Comparing a variety of sma
 ll-molecule donor-fullerene combinations\, we illustrate how tuning of mol
 ecular orientation and interfacial mixing leads to a trade-off between pho
 tovoltaic gap and charge-splitting and detrapping forces\, with consequenc
 es for the design of efficient photovoltaic devices.\n\n[1] C. Poelking\, 
 M. Tietze\, C. Elschner\, S. Olthof\, D. Hertel\, B. Baumeier\, F. Wuerthn
 er\, K. Meerholz\, K. Leo\, D. Andrienko\, Nature Materials\, 14\, 434-439
 \, 2015 [2] C. Poelking\, D. Andrienko\, J. Am. Chem. Soc.\, 137\, 6320-63
 26\, 2015 [3] M. Schwarze\, W. Tress\, B. Beyer\, F. Gao\, R. Scholz\, C. 
 Poelking\, K. Ortstein\, A. A. Guenther\, D. Kasemann\, D. Andrienko\, K. 
 Leo\, Science\, 2016 [4] C. Poelking\, D. Andrienko\, J. Chem. Theory Comp
 ut.\, 2016\, 12\, 4523
LOCATION:CH G1 495 https://plan.epfl.ch/?room==CH%20G1%20495
STATUS:CONFIRMED
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