Study on Optical Properties of Quasi-two-dimensional Perovskite (PEA)2(CH3NH3)2Pb3I10 and Photostability After Quality Optimization
To investigate the optical properties and photostability of quasi-2D perovskite,we focused on(PEA)2(CH3NH3)2Pb3I10(PMPI3)as our research subject.Physical characterization revealed that the structure of PMPI3 contained n＜3 substances.By analyzing photoluminescence(PL)spectra and conducting correlation fitting calculations,we observed a continuous blue shift in the PL peak of PMPI3 film as the temperature increased.Additionally,we observed a significant inhomogeneous broadening value and a strong electron-phonon coupling strength for Fröhlich scattering.Notably,different power law coefficients were observed at low temperature and room temperature.By studying the change in light attenuation,we discovered that optimizing the PMPI3 film with an appropriate amount of additive MAAc resulted in higher photostability.These observations suggest that PMPI3 is a multi-phase mixed material with distributed internal structure containing defects of n＜3 substances,indicating disorder and a higher number of defects.Additionally,polarons in PMPI3 directly contribute to the photophysical process as carriers.At low temperatures,the PL spectrum of PMPI3 is generated by excitons,whereas at room temperature,both free carriers and/or bound carriers participate in the recombination process.The inclusion of MAAc additive not only enhances the quality of the PMPI3 film,but also passivates the iodide ions in the film,effectively improving the photostability of PMPI3.
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