Dapeng Yu GT. First principle study optical properties of CH3NH3PbI3 and CH3NH3SnI3 for perovskite photovoltaics. engineering and maths [Internet]. 2015 Oct. 22 [cited 2024 Jul. 22];4(5):49-55. Available from: https://innovativejournal.in/index.php/ajcem/article/view/1233