The Rapid Evolution of Highly Efficient Perovskite Solar Cells
February 10th, 2017 JUAN-PABLO CORREA-BAENA Massachusetts Institute of Technology (MIT)

Perovskite solar cells (PSC) have attracted much attention for their rapid rise to 22% efficiencies. In this presentation, I will review the rapid evolution of PSCs and the contributions that I have made to the field, as these enter a new phase that could revolutionize the photovoltaic industry. In particular, I will describe some of the properties that make perovskites so remarkable; the current understanding of the PSC device physics, including operation of state-of-the-art solar cells with efficiencies above 20%. In particular, I will discuss the progress of planar junction PSCs as this simple type of architecture is advantageous for large-scale manufacturing. The planar configuration is composed of a simple stack of conductive glass, electron selective, perovskite, and hole transport layers, topped by a metal electrode. These low cost, low temperature mesoporous-free planar devices have struggled to keep up the high efficiencies garnered by their mesoporous counterparts. Recent breakthroughs by some of us in the community have changed this dynamic, showing that highly efficient planar PSCs are possible by understanding energetics and improving processing. Employing atomic layer deposited SnO2 as the electron selective layer has yielded efficiencies of 19.5%. More recently, we demonstrated the use of solution-processed SnO2 in planar devices that yielded a record for planar PSCs of 21%. Finally, the extraordinary progress of long-term stability will be discussed and I will provide an outlook on what the future of PSCs might soon bring to the photovoltaic community.

Seminar, February 10, 2017, 12:00. Seminar Room.

Hosted by Prof. Jordi Martorell