Abstract
The deposition of a thin layer of a quantum-cutter material on top of silicon-based solar cells seems to be a promising solution to reduce the thermalization losses. This mechanism has been reported in materials codoped with , where can sensitize two ions for one absorbed blue photon. In the present Letter, we analyze precisely energy transfers between and in , and we measure a quantum-cutting rate of 145%. We show that a very efficient back transfer from toward the level of ion leads to a strong reduction of the quantum yield.
©2012 Optical Society of America
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