Events

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

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@mit.edu