That doesn't seem very plausible: fundamentally all accessible sunlight hits the ground somewhere or other (until we start talking about space mirrors and things like that), so while you can use mirrors to concentrate sunlight (as solar thermal plants do) you can't really beat collecting x amount of solar radiation from y square meters of ground. You can build a tall structure that collect the sunlight hitting the side of it, but obviously that's going to block said sunlight from a correspondingly large area of ground in its shadow; at extreme latitudes where the sunlight mostly comes in sideways you get more concentrated sunlight that way (at the cost of an even bigger shadow), but I doubt it'd be worth the overhead.