Number of junction

Optimum bandgap energy combination

1

1.34 eV

2

1.60/0.93 eV

3

1.90/1.37/0.93 eV

4

2.00/1.49/1.11/0.72 eV

5

2.14/1.67/1.33/1.01/0.70 eV

6

2.19/1.73/1.41/1.13/0.79/0.51 eV