Minimizing Roughness Induced Optical Losses for a Four-Terminal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mrow><mml:mi>Cd</mml:mi><mml:mi>Te</mml:mi></mml:mrow><mml:mo>/</mml:mo><mml:mi>Si</mml:mi></mml:math> Tandem Solar Cell
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