1. The bifacial cell has an open backside, which enables collection of the substantial amount of reflected light available from the earth, rooftops, clouds and the atmosphere.
2. Bifacial solar cells have an open and active backside which enables collection of reflected light available from the earth, rooftops.
http://www.solarmango.com/dictionary/bifacial-cell/ (1.); http://globenewswire.com/news-release/2017/01/12/996686/0/en/Aurora-Solar-Technologies-Introduces-Bifacial-Solar-Cell-Optimization-System.html (2.)
Author: Simon Waterstradt