I think you're mistaken about the light bouncing around in the cell. Traditional cells have had efficiency problems because of electrons bouncing around, not light. Light is absorbed pretty efficiently even by current cells. Most of the electrons that are ejected by photons in current cells never become part of the electric current unfortunately. I haven't read the article because it requires a sub.

So, let me get this straight?

The Global warming effect i.e. the greenhouse effect is actually good for Solar cells, which in turn is good for the environment!

Wow, I want a greenhouse effect in my house, just for the heat.

oh, err, sorry forgot this was an important subject, save the earth and all that, along with not forgetting to pay my green tax's and putting my recycling stuff out, so they can dump it in the same hole. 

Excellent.

Keep up the good work guys.

I always thought Bijli was an Indian word for electricity...