PP1.3b Silicon Tandem Cells (mechanically stacked)

Project Coordinator: 
Chief Investigators: 
Andrew Blakers
Associate Investigators: 
Monash University

An alternative approach to implementing silicon tandem cells is mechanical stacking with independent connection to each cell in the stack. This removes constraints upon the matching of current, lattice constant and thermal expansion coefficient, albeit at the cost of additional mounting and interconnection costs. The best available silicon and wide bandgap cells can be separately optimised and mounted together. 

Current proof-of-concept work is focused on reflector-based architectures to direct long wavelength light to the silicon cell. This enables the use of commercially available conventional GaAs cells as the top cell in the stack. Design of the mounting, optics and interconnection is critical to maximising performance. Longer term design preferences are for transparent top cells which offer more flexibility in the application of the tandem structure.