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Download fileRapid Charge-Transfer Cascade through SWCNT Composites Enabling Low-Voltage Losses for Perovskite Solar Cells
journal contribution
posted on 2019-06-20, 00:00 authored by Severin N. Habisreutinger, Nakita K. Noel, Bryon W. Larson, Obadiah G. Reid, Jeffrey L. BlackburnGood charge selective
contacts are vital to achieving efficient
perovskite solar cells. The selectivity of such a contact is determined
by its energetic offset or alignment with the bands of the perovskite
absorber and, most importantly, by its interfacial recombination losses.
In this study, we use single-walled carbon nanotubes (SWCNTs) as a
high-mobility hole extraction layer at the interface with a perovskite
absorber. When employed as a charge-transfer cascade-like structure
with a low-mobility hole-selective contact, this configuration can
suppress the interfacial recombination through the rapid removal of
holes from the interface region. Reducing these recombination losses
in turn results in very low voltage losses of less than 340 mV in
n-i-p perovskite solar cells.