Article
Enhanced Stability of Perovskite Solar Cells Incorporating Dopant-Free Crystalline Spiro-OMeTAD Layers by Vacuum Sublimation
Author/s | Barranco Quero, Ángel
López Santos, Carmen Idígoras León, Jesús Aparicio Rebollo, Francisco Javier Obrero Pérez, José M. López Flores, Víctor Contreras-Bernal, Lidia Rico-Gavira, Víctor Joaquín Ferrer Fernández, Francisco Javier Espinós, Juan P. Borrás Martos, Ana Anta Montalvo, Juan Antonio Sánchez Valencia, Juan Ramón |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 2020 |
Deposit Date | 2023-03-10 |
Published in |
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Abstract | The main handicap still hindering the eventual exploitation of organometal halide perovskite-based solar cells is their poor stability under prolonged illumination, ambient conditions, and increased temperatures. This ... The main handicap still hindering the eventual exploitation of organometal halide perovskite-based solar cells is their poor stability under prolonged illumination, ambient conditions, and increased temperatures. This article shows for the first time the vacuum processing of the most widely used solid-state hole conductor (SSHC), i.e., the Spiro-OMeTAD [2,2′,7,7′-tetrakis (N,N-di-p-methoxyphenyl-amine) 9,9′-spirobifluorene], and how its dopant-free crystalline formation unprecedently improves perovskite solar cell (PSC) stability under continuous illumination by about two orders of magnitude with respect to the solution-processed reference and after annealing in air up to 200 °C. It is demonstrated that the control over the temperature of the samples during the vacuum deposition enhances the crystallinity of the SSHC, obtaining a preferential orientation along the π–π stacking direction. These results may represent a milestone toward the full vacuum processing of hybrid organic halide PSCs as well as light-emitting diodes, with promising impacts on the development of durable devices. The microstructure, purity, and crystallinity of the vacuum sublimated Spiro-OMeTAD layers are fully elucidated by applying an unparalleled set of complementary characterization techniques, including scanning electron microscopy, X-ray diffraction, grazing-incidence small-angle X-ray scattering and grazing-incidence wide-angle X-ray scattering, X-ray photoelectron spectroscopy, and Rutherford backscattering spectroscopy. |
Funding agencies | Ministerio de Economia, Industria y Competitividad (MINECO). España European Union (UE). H2020 |
Project ID. | MAT2016-79866-R
MAT2013-42900-P FPA2016-77689-C2-1-R MAT2016-76892-C3-2-R 654360 |
Citation | Barranco Quero, Á., López Santos, C., Idígoras León, J., Aparicio Rebollo, F.J., Obrero Pérez, J.M., López Flores, V.,...,Sánchez Valencia, J.R. (2020). Enhanced Stability of Perovskite Solar Cells Incorporating Dopant-Free Crystalline Spiro-OMeTAD Layers by Vacuum Sublimation. Advanced Energy Materials, 10 (2), 1901524. https://doi.org/10.1002/aenm.201901524. |
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