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Electronic and optical properties of CsGeX <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1017" altimg="si35.svg"> <mml:msub> <mml:mrow/> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:math> M (X ,M = Br, Cl, I) perovskites for solar cell applications: First-principles study using PBE and TB-mBJ potentials