Effect of guanidinium on the optical properties and structure of the methylammonium lead halide perovskite
[EN] The stability and performance of perovskite-based solar cells can be improved by changing the nature of the organic cation. Herein, mixed methylammoniumeguanidinium perovskites (MA1-xGAxPbI3) are structurally and optically characterized. The Pawley fit method confirmed the formation of the iodi...
| Authors: | , , |
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| Format: | article |
| Publication Date: | 2018 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:riunet.upv.es:10251/123858 |
| Online Access: | https://riunet.upv.es/handle/10251/123858 |
| Access Level: | Open access |
| Keyword: | Thin film perovskite Mixed halide perovskite Gap energy Chemical composition Photoluminescence FISICA APLICADA |
| Summary: | [EN] The stability and performance of perovskite-based solar cells can be improved by changing the nature of the organic cation. Herein, mixed methylammoniumeguanidinium perovskites (MA1-xGAxPbI3) are structurally and optically characterized. The Pawley fit method confirmed the formation of the iodide halide GAPbI3 tetragonal phase (P42_NMC). Up to 20% of the guanidinium cation was incorporated in the methylammonium lead iodide perovskite, producing a lattice enlargement, which was investigated studying the shift of the diffraction peaks of the MAPbI3 (I4_CM) tetragonal lattice. Long-term stability was tested, resulting in improved mixed perovskites with a low GA content. The bandgap shifted to lower energies. The absorption bandgap diminished slightly when the GA cation substituted up to 20% of MA in MAPbI3, degrading when the GA amount in the mixed perovskite is larger. FESEM morphological analysis was performed showing that a uniform thin film was deposited. PL studies showed that only shallow defects had been introduced. |
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