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Xiaozhou Che1 Yongxi Li1 Yue Qu1 Stephen Forrest1

1, Univ of Michigan, Ann Arbor, Michigan, United States

Organic photovoltaic cells (OPVs) offer a light weight and potentially cost-effective approach for solar energy harvesting. Recent studies on solution processed, non-fullerene acceptors (NFAs) has led to single junction cell efficiencies > 13%. Here we report a tandem OPV structure with a NFA-based near infrared subcell spin-coated on a visible-absorbing subcell grown by vacuum thermal evaporation (VTE). A novel charge recombination zone completely protects the VTE layers from dissolution during deposition of the NFA-based active layer. The tandem cell achieves the power conversion efficiency of 15.0%. This work demonstrates the feasibility of combining subcells with different processing techniques for achieving efficient OPVs, providing flexibility over current multijunction designs.

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