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Let's say a 'transparent' solar panel that converts 10% of sunlight to electricity will allow 65-75% of light to pass through (allowing for some light that is trapped but not converted to electricity). So what? Most high-rise buildings anyway use glass that is tinted and/or reflective and do not have the same view from inside as there would be with clear glass.
Sure, if they keep increasing efficiency it would become a 'wall', however there is no scope for that, since the idea is to harvest sunlight from areas that could otherwise not be used. Since for 'normal' photovoltaic cells, efficiency now is around 25%, being able to get 10% from what is otherwise 'unused' space is a huge bonus.
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