AI Article Synopsis
- Perovskite films were created using a single step solution deposition method, with variations in annealing temperatures and times to optimize their properties.
- Advanced techniques like XRD, XPS, and SEM/EDX revealed the films exhibited a tetragonal crystal structure, transitioning from a yellow intermediate phase to a black perovskite phase.
- The study found that high purity films were achieved at 100 °C and that the intermediate phase could be transformed into the black perovskite phase through X-ray irradiation or by heating aged films.
Article Abstract
Perovskite films were prepared using single step solution deposition at different annealing temperatures and annealing times. The crystal structure, phases and grain size were investigated with XRD, XPS and SEM/EDX. The prepared films show a typical orientation of tetragonal perovskite phase and a gradual transition at room temperature from the yellow intermediate phase to the black perovskite phase. Films with high purity were obtained by sintering at 100 °C. In addition, the chemical composition and crystal structure of intermediate phase were investigated in detail. FTIR, UV-vis and NMR spectra revealed the occurance of DMF complexes. Interestingly, the intermediate phase could be transformed to the black perovskite phase upon X-ray irradiation. In addition, the recovery of the aged perovskite films from a yellow intermediate phase back to the black perovskite was shown to be viable via heating and X-ray irradiation.
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| http://dx.doi.org/10.1039/c5dt04420k | DOI Listing |
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