Progress in the performance and reliability of TOPCon technology

Bram Hoex

School of Photovoltaic and Renewable Energy Engineering, UNSW, Australia

E-mail: b.hoex@unsw.edu.au

Abstract

This presentation provides an overview of the latest advancements in Tunnel Oxide Passivated Contact (TOPCon) solar cells and modules, emphasizing both performance and reliability to reduce the levelized cost of electricity (LCOE). Additionally, laser-assisted firing techniques are highlighted for their role in improving contact formation and reducing contact resistance, thereby enhancing overall device performance.

While efficiency improvements are vital, achieving the lowest LCOE also requires extended module longevity with annual performance degradation rates below 0.5%. We will go into the reliability aspects of TOPCon technology, focusing on understanding and mitigating corrosion-induced degradation. Advanced accelerated cell testing methodologies are introduced, offering rapid assessment of degradation mechanisms—up to a hundred times faster than conventional methods. This acceleration enables timely insights and the development of effective mitigation strategies. Finally, approaches to preventing degradation at both the cell and module levels will be discussed, including detailed modelling of selected degradation modes on a global scale.

Keywords: Silicon solar cells; Performance; Reliability; TOPCon