What is the efficiency of a CPV cell in direct sunlight (without the concentrator)?

What is the efficiency of a CPV cell in direct sunlight (without the concentrator)?

I have seen some cpv panels on sale, for example on ebay, that say that they have around 37% efficiency, and the charts look like that efficiency gets higher under a lower amount of suns, as high as 43% or so. However, I can't find in the chart anything that says their efficiency under direct sunlight, and I understand that they are expensive but I was wondering if anyone had any information of their efficiency under a single sun (without a concentrator). I believe that these cells may also be known as triple junction and are usually 1cm2.

submitted by /u/joshglen
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