layer 1 is disposed adjacent the coverglass table ii layer layer formula layer thickness nm 1 hfo 2 7 4 7 8 2 sio 2 50 6 53 6 3 hfo 2 26 5 28 1 4 sio 2 23 4 24 8 5 hfo 2 78 7 83 5 6 sio 2 10 8 11 4 7 hfo 2 36 1 38 3 8 sio 2 90 3 95 9 alternating layers of sio 2 60 sio 2 and 40 hfo 2 approximate volumetric blend ratios and hfo 2 can be used to produce a notch filter 602 as shown in table iii in this embodiments the anti reflection coating 704 and notch filter 602 coatings are applied to sides of the coverglass 702 and the notch filter side can affixed to the solar cell 200 with an adhesive in the configuration the adhesive 706 and the coverglass 702 provide the l material for the first and last layers table iii layer thickness layer layer layer formula nm type 2 60 sio 2 40 hfo 2 75 9 80 5 m 3 4 hfo 2 121 2 128 6 hh 5 60 sio 2 40 hfo 2 89 0 94 4 m 6 7 sio 2 39 3 41 7 ll 8 60 sio.