High Efficiency Tandem Thin-Perovskite/Polymer Solar Cells with a Graded Recombination Layer

  • Liu Y
  • Renna L
  • Bag M
 et al. 
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Abstract

Perovskite-containing tandem solar cells are attracting attention for their potential to achieve high efficiencies. We demonstrate a series connection of a ∼90 nm thick perovskite front subcell and a ∼100 nm thick polymer:fullerene blend back subcell that benefits from an efficient graded recombination layer containing a zwitterionic fullerene, silver (Ag), and molybdenum trioxide (MoO3). This methodology eliminates the adverse effects of thermal annealing or chemical treatment that occurs during perovskite fabrication on polymer-based front subcells. The record tandem perovskite/polymer solar cell efficiency of 16.0%, with low hysteresis, is 75% greater than that of the corresponding ∼90 nm thick perovskite single-junction device and 65% greater than that of the polymer single-junction device. The high efficiency of this hybrid tandem device, achieved using only a ∼90 nm thick perovskite layer, provides an opportunity to substantially reduce the lead content in the device, while maintaining the high performance derived from perovskites

Author-supplied keywords

  • fullerene interlayers
  • high efficiency
  • high open-circuit voltage
  • interface engineering
  • inverted structure
  • perovskite solar cells
  • polymer solar cells
  • tandem solar cells

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