The Study of Lead-Free CH3NH3GeX3 (X=F, Cl, Br, I and At) for Optoelectronic Applications Using First-Principle. NJP [Internet]. 2024 Jun. 30 [cited 2025 Apr. 26];33(2):30-4. Available from: https://njp.nipngr.org/index.php/njp/article/view/215