Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202010572
Keywords
carrier transport; CsFA; doping; perovskites; solar cells
Categories
Funding
- Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7)
- US Department of the Navy, Office of Naval Research [N00014-17-1-2524]
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Researchers have pursued perovskites with the multi-cation composition of Cs, MA, and FA for their high power conversion efficiencies, but their thermal stability is limited. To overcome this limitation, a band engineering strategy for CsFA perovskite-based inverted solar cells has been developed, which successfully improves carrier diffusion and achieves stabilized power conversion efficiencies of 20.3% in CsFA solar cell devices.
Perovskites with the multi-cation composition of cesium (Cs), methylammonium (MA), and formamidinium (FA) (CsMAFA) are pursued for their high power conversion efficiencies, but they are limited by their thermal stability. To withstand damp-heat accelerated aging MA-free compositions such as CsFA are of interest, but these exhibit lower carrier diffusion lengths and thus lesser performance in photovoltaic devices. A band engineering strategy that overcomes limited carrier diffusion within inverted perovskite solar cells based on CsFA is reported. A joint experimental-computational study shows that treating the perovskite with an n-type molecular dopant increases band bending, shaping the electric field across the active layer to overcome limited diffusive transport. Using this strategy, CsFA solar cell devices with stabilized power conversion efficiencies of 20.3%, a high value for devices using CsFA active layers, are fabricated.
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