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CENTER FOR EXCITONICS Seminar Series
Band Alignment Engineering in Highly Efficient Planar Perovskite Solar Cells*
September 22, 2015 at 4:30 pm/36-428
Juan-Pablo Correa-Baena
ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE EPFL
[j.correa-epfl]
In the past few years, perovskite solar cells have shown an unprecedented increase in
efficiency from 3.8% in 2009 to a current record of 20.1%. One key challenge for
commercialization of perovskite solar cell is to provide a simple architecture where a
planar perovskite layer is sandwiched between charge selective contacts. Such planar
devices have often been shown to be prone to large hysteretic behavior and current
instability which hampers the overall performance. This is often attributed to the
interface dynamics between the perovskite/hole, or perovskite/electron acceptor material.
In this study, I show a low-temperature process for producing highly efficient planar
perovskite solar cells and analyze the role of electron acceptor layers in the current
instability and hysteresis behavior. From this, I present a comprehensive strategy towards
record efficiencies of over 17%.
Juan Pablo Correa Baena is a postdoctoral researcher in the group of Professor Anders
Hagfeldt at the Ecole Polytechnique Fédérale de Lausanne (EPFL). Originally from Colombia,
he pursued his higher education studies at the University of Connecticut, USA. His PhD
work focused on the study of interafaces of metal oxide materials, in particular,
transparent conducting (tin oxide-based) aerogels and thin films, and their use in
dye-sensitized solar cells. Currently he works on perovskite solar cell research focusing
on understanding the interfacial dynamics between the perovskite materials and the
electron and hole selective layers.
*This talk is part of the Perovskites Seminar Series organized by Sam Stranks and
sponsored by the Center for Excitonics. For more info contact Sam Stranks:
stranks(a)mit.edu
The Center For Excitonics Is An Energy Frontier Research Center Funded By The U.S.
Department Of Energy,
Office Of Science And Office Of Basic Energy Sciences
Light refreshments will be served
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