by Harry Baggen @ elektormagazine.com:
The Belgian nanoelectronics research center Imec has developed a very efficient bifacial n-PERT (BiPERT) solar cell technology with a bifaciality factor of nearly 100%. The cell efficiency at the rear is nearly as high as the efficiency at the front.
Bifacial solar cells capture not only the light falling on the front of the solar panel, but also the light falling on the rear – including light reflected from clouds or the background, diffuse light, and even direct light at sunrise and sunset. Bifacial module are therefore able to generate more electricity than conventional monofacial modules.
Bifacial solar cells boost efficiency – [Link]