Is a 90% Efficient Solar Panel Possible?

No, a 90% efficient solar panel is not practically achievable today because it far exceeds known physical and engineering limits for photovoltaics.

A photovoltaic efficiency limit known as the Shockley Queisser limit constrains single junction cells, therefore single junction panels rarely exceed about 33%.

Advanced multijunction cells raise conversion under concentrated sunlight, so laboratory records sit around the mid 40s percent and practical systems remain far below ninety percent due to complexity and cost.