Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 14, Issue 8, Pages 4377-4390Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ee01206a
Keywords
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Funding
- King Abdullah University of Science and Technology (KAUST)
- IED [OSR-2019-4208]
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By developing new contact materials, the research team successfully converted high-efficiency single-junction perovskite solar cells into efficient perovskite/silicon tandem solar cells, achieving a conversion efficiency of up to 27%.
Translating the high power conversion efficiencies of single-junction perovskite solar cells in their classic, non-inverted (n-i-p) architecture to efficient monolithic n-i-p perovskite/silicon tandem solar cells with high current densities has been a persistent challenge due to the lack of low-temperature processable, chemically-insoluble contact materials with appropriate polarity and sufficient optical transparency. To address this, we developed sputtered amorphous niobium oxide (a-NbOx) with ligand-bridged C-60 as an efficient electron-selective contact, deposited on the textured-silicon bottom cell. For the sunward, hole-selective contact we implemented a stack of molecularly doped broadband transparent evaporated 2,2 ',7,7 '-tetra(N,N-di-p-tolyl)amino-9,9-spirobifluorene (spiro-TTB) and atomic layer deposited vanadium oxide, which further enhances the device quantum efficiency. Combining these contact materials with two-dimensional perovskite passivation on the micrometer-thick solution-processed perovskite top cell yields 27% efficient monolithic n-i-p perovskite/silicon tandem solar cells, which represents one of the highest power conversion efficiencies reported on pyramidal textured crystalline silicon bottom cells, and the highest with this polarity.
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