Putting it closer to the sun would mean that it could gather more light, but you’d lose more in the transmission back to Earth; whether or not it would pay off, I can’t tell.
The big problem is getting the power back to Earth; you can’t run a cable down (although some people think this will be possible one day - search on “space elevator”), so you have to beam it down as electromagnetic radiation of some kind; so there’s a tight, intense beam of [some kind of] radiation (let’s say microwaves) going straight down through the atmosphere. What happens if something flies through the beam? What happens if a micrometeor hits your satellite and it wanders off target by a fraction of a degree? - the other end of the beam moves off target by a considerable distance, frying anything in the way.
Not In My Back Yard, as they say.