Interface Optoelectronics for Tandem Solar Cells by Perovskite and Silicon

Seigo Ito

University of Hyogo

Abstract: In order to fabricate tandem solar cells by perovskite and silicon, 5-mm square-shaped silicon solar cells have been fabricated by a facile method.  Afterward, engineering of photonics for antireflection and electronics for extraction of the hole using a thin Au layer have been performed for two- and four-terminal tandem solar cells using CH3NH3Pb(I-Br)3 perovskite (top cell) and p-type single crystal silicon (c-Si) (bottom cell) by mechanically stacking.  Highly transparent connection multilayers of Au and ITO films were depositted at the interface to be a point-contact tunneling junction between the rough perovskite and flat silicon solar cells.  Moreover, we have analyzed the sputtering effect on spiro-OMeTAD HTM layer, which can deteriorated the photovoltaic effects of tandem devise significantly.  Also, the mechanically stacked tandem solar cells with several configurations as Fig. 1 were fabricated with MoOx and ITO interface layers.  In the conference, the detail results of optoelectronics phenomena about silicon and perovskite solar cells will be disclosed.  

Figure 1 .Structure of tandem solar cells using perovskite and silicon.

Biography: Seigo Ito received his Ph.D. from the University of Tokyo (Japan), with a thesis that was the first to discuss Grätzel-type dye-sensitized solar cells in Japan.  He worked in the Laboratory of Professor Shozo Yanagida (Osaka University, Japan) for two years, and in the Laboratory of Professor Michael Grätzel, at the Swiss federal Institute of Technology (EPFL) in Lausanne as a postdoctoral scientist for over three years, where his efforts focused on the progress of high-efficiency dye-sensitized solar cells.  He is currently Professor at University of Hyogo, making new printable cost-effective solar cells (perovskite and silicon) and new catalysts for the water electrolyzing and hydrogen-fuel cells.