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Suman Kumar
This can be explained very simply by considering that at higher temperature, the semiconductor will produce more electron hole pairs and the band gap will decrease,
Due to this production of extra electron hole pairs the fermi level moves down towards the valance band.
little math is there
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.quora.com/What-is-the-effect-of-temperature-on-the-Fermi-level-of-N-type-and-P-type-semiconductors&ved=2ahUKEwi2g-H_xZTrAhWuzjgGHZyvBlAQFjAKegQICxAB&usg=AOvVaw0qoc7C9QRfaxeASK2qBkSJ&cshid=1597198864851
See this