2D perovskites have broad technological appeal because of their tunable mechanical, optical, and electrical properties. For flexible optoelectronic applications, it is necessary to determine how mechanical stresses affect their optoelectronic properties. We compare the impact of strain on the photoluminescence (PL) spectra and charge carrier recombination rates of two different 2D perovskite materials, synthesized using either phenethylammonium or butylammonium cations. Both perovskite materials exhibit strong PL enhancement, redshifts of the PL emission wavelength, and longer recombination lifetimes for compressive strains of ≲1%. These results are discussed in relation to the materials’ band structures and trap states.
2D perovskites, consisting of alternating layers of metal halide sheets and cations, tend to be more environmentally robust compared to their bulk 3D counterpart and have broad technological appeal because of their tunable mechanical, optical, and electrical properties. While these materials have promise for flexible optoelectronic applications, it is necessary to determine the impact of strain on the perovskite optical and electronic properties. Here, we discuss our work in understanding how strain modifies the carrier dynamics of 2D perovskites using time resolved spectroscopy. We compare the photoluminescence lifetime of two different 2D perovskite materials, synthesized using either phenethylammonium or butylammonium cations. Both perovskite materials exhibit about a 50% decrease in the lifetime for tensile strains <1%. The decrease in the photoluminescence lifetime, indicating a decrease in the charge carrier lifetime, is discussed in relation the materials defect states and bands
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