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## Extra ideas  * Quantum Dots  * Solar concetrators concetrators: \( \zeta_{SQ} \) can be improved by the use of concentrators, as seen in the 2015 Apporaching SQ limit paper, many of the inefficiencies get toned down in the presence of concentrators, the effect is of an increase of 2-3% in total efficency.  Could be more for CdTe, we would need to model this aspect.  * Double heterostructures (DH) \cite{Swartz_2014}