What is the denominator on the efficiency calculation? Total solar power output (at ground level), or power output in the spectrum band PVs operate on? This is

What is the denominator on the efficiency calculation? Total solar power output (at ground level), or power output in the spectrum band PVs operate on? This is not what the article meant, but I wonder if in the latter case, efficiency can be increased "past 100%" by expanding the spectrum converted to energy.