The role of Nb2O5 deposition process on perovskite solar cells

Two different methods are used to deposit Nb2O5 as compact electron transport layers in n-i-p double cation mixed-halide perovskite Cs0.17FA0.83Pb(I0.83Br0.17)3 solar cells: reactive sputtering and spin coating. These different Nb2O5 films influenced perovskite growth and the charge transport in the...

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Bibliographic Details
Published in:Journal of renewable and sustainable energy 2022-07, Vol.14 (4)
Main Authors: Fernandes, Silvia L., Garcia, Larissa de O., Júnior, Roberto de A. Ramos, Affonço, Lucas J., Bagnis, Diego, Vilaça, Rodrigo, Pontes, Fenelon M., da Silva, José H. D., Graeff, Carlos F. O.
Format: Article
Language:English
Subjects:
Charge transport
Coating effects
Diffusion coating
Electron transport
Energy conversion efficiency
Grain boundaries
Grain size
Ion diffusion
Niobium oxides
Perovskites
Photovoltaic cells
Solar cells
Spin coating
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Summary:Two different methods are used to deposit Nb2O5 as compact electron transport layers in n-i-p double cation mixed-halide perovskite Cs0.17FA0.83Pb(I0.83Br0.17)3 solar cells: reactive sputtering and spin coating. These different Nb2O5 films influenced perovskite growth and the charge transport in the cells. Photovoltaic parameters were obtained with an average power conversion efficiency of 17.0% and 15.7% for the devices based on sputtered and spin-coated Nb2O5, respectively. The mobility and the extracted charges were higher in sputtered Nb2O5-based devices than in the spin-coated ones. This effect is attributed to the larger grain sizes observed in the perovskite films when deposited onto the sputtered Nb2O5 layers. The higher densities of grain boundaries in the spin-coated Nb2O5-based devices increase ion diffusion and are expected to decrease efficiency.
ISSN:1941-7012
1941-7012
DOI:10.1063/5.0083073