Dimesso, Lucangelo ; Wittich, Carolin ; Mayer, Thomas ; Jaegermann, Wolfram (2019)
Phase-change behavior of hot-pressed methylammonium lead bromide hybrid perovskites.
In: Journal of Materials Science, 54 (3)
doi: 10.1007/s10853-018-3009-6
Article, Bibliographie
Abstract
The investigation of hot-pressed methylammonium lead bromide (MAPbBr3) is reported. The as-prepared materials consisted of microcrystallites (30–500 μm size) with a non-centrosymmetric pseudo-cubic tetragonal crystalline structure (P4 mm space group). The thermal analysis under air showed a thermal stability of MAPbBr3 perovskite till T = 250 °C and a broad endothermic event at T = 371 °C (melting point of solid PbBr2). Under increasing pressure at room temperature, the MA–Pb–Br system retained the pseudo-cubic tetragonal structure, the optical adsorption spectra displayed a strong absorption edge between 570 and 572 nm, and the Tauc plots revealed a direct semiconducting behavior with band energy gaps around 2.20(± 0.01) eV. The steady-state emission (PL) photoluminescence spectra (excitation wavelengths λexc = 380 nm) showed an emission band at ~ 574 nm. With increase in the temperature (under constant pressure and treatment time), the MA–Pb–Br system turned into the higher cubic symmetry (space group Pm3¯m), the absorption edges shifted to 571–575 nm, and at T = 120 °C, the absorbance profile begins to increase at higher wavelengths (> 600 nm). By increasing the pressure at constant temperature, the perovskite adopted the cubic structure and a slight decrease in the energy band gap (2.17 eV for T = 150 °C and P = 15 MPa) was recorded. With increase in the hot-pressing time at T = 150 °C and P = 20 MPa, the optical absorption edges remained at ~ 575 nm; however, the decrease in the absorbance can indicate a degradation of the materials. The changes in the emission mechanism(s) of the hot-pressed materials can be related to the observed change in the crystalline structure and morphology.
Item Type: | Article |
---|---|
Erschienen: | 2019 |
Creators: | Dimesso, Lucangelo ; Wittich, Carolin ; Mayer, Thomas ; Jaegermann, Wolfram |
Type of entry: | Bibliographie |
Title: | Phase-change behavior of hot-pressed methylammonium lead bromide hybrid perovskites |
Language: | German |
Date: | February 2019 |
Publisher: | Springer |
Journal or Publication Title: | Journal of Materials Science |
Volume of the journal: | 54 |
Issue Number: | 3 |
DOI: | 10.1007/s10853-018-3009-6 |
URL / URN: | https://doi.org/10.1007/s10853-018-3009-6 |
Abstract: | The investigation of hot-pressed methylammonium lead bromide (MAPbBr3) is reported. The as-prepared materials consisted of microcrystallites (30–500 μm size) with a non-centrosymmetric pseudo-cubic tetragonal crystalline structure (P4 mm space group). The thermal analysis under air showed a thermal stability of MAPbBr3 perovskite till T = 250 °C and a broad endothermic event at T = 371 °C (melting point of solid PbBr2). Under increasing pressure at room temperature, the MA–Pb–Br system retained the pseudo-cubic tetragonal structure, the optical adsorption spectra displayed a strong absorption edge between 570 and 572 nm, and the Tauc plots revealed a direct semiconducting behavior with band energy gaps around 2.20(± 0.01) eV. The steady-state emission (PL) photoluminescence spectra (excitation wavelengths λexc = 380 nm) showed an emission band at ~ 574 nm. With increase in the temperature (under constant pressure and treatment time), the MA–Pb–Br system turned into the higher cubic symmetry (space group Pm3¯m), the absorption edges shifted to 571–575 nm, and at T = 120 °C, the absorbance profile begins to increase at higher wavelengths (> 600 nm). By increasing the pressure at constant temperature, the perovskite adopted the cubic structure and a slight decrease in the energy band gap (2.17 eV for T = 150 °C and P = 15 MPa) was recorded. With increase in the hot-pressing time at T = 150 °C and P = 20 MPa, the optical absorption edges remained at ~ 575 nm; however, the decrease in the absorbance can indicate a degradation of the materials. The changes in the emission mechanism(s) of the hot-pressed materials can be related to the observed change in the crystalline structure and morphology. |
Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Surface Science Profile Areas Profile Areas > Thermo-Fluids & Interfaces |
Date Deposited: | 12 Dec 2018 08:54 |
Last Modified: | 07 Mar 2019 11:33 |
PPN: | |
Funders: | The author thank the Federal Ministry of Research and Development (BMBF) (Project “Perosol” Nr. 03SF0483B) for the financial support during this work. |
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