How Does Heat Affect Solar Panel Efficiency?

https://www.cedgreentech.com/article/how-does-heat-affect-solar-panel-efficiencies

"It may seem counter-intuitive, but solar panel efficiency is affected negatively by temperature increases.  Photovoltaic modules are tested at a temperature of 25 degrees C (STC) – about 77 degrees F., and depending on their installed location, heat can reduce output efficiency by 10-25%."