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Highly efficient hybrid multijunction solar cells are constructed with a wide‐bandgap amorphous silicon for the front subcell and a low‐bandgap polymer for the back subcell. Power conversion efficiencies of 11.6% and 13.2% are achieved in tandem and triple‐junction configurations, respectively. The high efficiencies are enabled by deploying effective optical management and by using photoactive materials...
Novel wide‐bandgap semiconducting polymers are designed and synthesized for multijunction polymer solar cell (PSC) applications. In single‐junction PSCs, BDT‐FBT‐2T exhibits efficiencies exceeding 6.5% for active layer thicknesses between 90 and 250 nm, with the highest efficiency of 7.7% at 100 and 250 nm. This enables tandem PSCs to be created with an efficiency of 8.9%.
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