The role of Nb2O5 deposition process on perovskite solar cells

Author(s)

Fernandes, Silvia L. ; Garcia, Larissa de O. ; Ramos Junior, Roberto de A. ; Affonco, Lucas J. ; Bagnis, Diego ; Vilaca, Rodrigo ; Pontes, Fenelon M. ; Da Silva, Jose H. D. ; Graeff, Carlos F. O.

• Document type: Journal article
• Source: Journal of Renewable and Sustainable Energy; v. 14, n. 4, p. 8-pg., 2022-07-01.

Abstract

Two different methods are used to deposit Nb2O5 as compact electron transport layers in n-i-p double cation mixed-halide perovskite Cs(0.17)FA(0.83)Pb(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. Published under an exclusive license by AIP Publishing. (AU)

• FAPESP's process: 20/12356-8 - Stability optimization of perovskite solar cells
• Grantee: Carlos Frederico de Oliveira Graeff
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 20/04905-1 - Study of the influence of humidity on mixed cation perovskites applied to photovoltaic devices
• Grantee: Larissa de Oliveira Garcia
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC