let me explain...

if I have ONE - 25 watt solar panel that is 12" x 12" , then I can take TEN of those same solar panels and wire them in parrallel and now get around 200-250 watts of power...but it would take up alot of space because each panel needs to be laid out FLAT and side by side, by the other panels...which
takes up alot of surface area.
now..with the cube solar panel techonologys...you just stack them all on top of each other...and they still achieve the same power/wattage ratings...but they dont need as much sq footage to achieve it...

keep in mind...that solar panels arent very thick ...it is the frames they come in, that makes them 2-3 " in thickness around the edges...take away those frames...and you now have solar panels that are 1/2" or less in thickness ...so you can now stack 10 of them on top of each other , and it would only take up about 5 -10" in thickness....so you now a solar cube of 10 solar panels that are 12" x 12" square and only about 6 " thick...

it isnt about a increase in efficeincy or ahcieving 100% efficiencys..its about being able to use MANY solar panels in a smaller space, then before.