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• W2964133619 abstract "Tin iodide perovskite CH3NH3SnI3 is often considered as a replacement for toxic lead halide perovskites. Tin iodide is not only suitable for production of solar cells, but also it emits in the near-infrared spectral region, which is unique among the metal halide perovskites. On the downside, the CH3NH3SnI3 layers tend to be of high unintentional p-type doping, which significantly limits the solar cell efficiency. On the other hand, it is little known how this doping could affect other optical and electrical properties important for light-emitting applications. Here, we present an optical study of carrier diffusion and recombination pathways by time-resolved photoluminescence, differential transmission, and light induced transient grating techniques at excitations close to the lasing regime. We investigate several CH3NH3SnI3 layers formed by a solvent bathing method and using different antisolvents, causing different structural quality and doping level of the layers. We observe the amplified spontaneous emission with a threshold excitation as low as 5 μJ/cm2; however, the threshold is sensitive to structural quality and increases significantly in the layers with larger surface roughness. We present an all-optical method to determine the equilibrium density of holes, which varies in the range of 0.7–5.0 × 1018 cm–3, depending on the antisolvent used for production of a particular layer. Finally, we observe band-like diffusion of carriers with high values of ambipolar diffusion coefficient: it grows from 0.5 to 1.5 cm2/s with excitation due to carrier degeneracy. High diffusivity, large quantum yield even at low densities, and low stimulated emission threshold allow us to argue that unintentional p-type doping can be beneficial for light emitting applications." @default.
• W2964133619 created "2019-07-30" @default.
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• W2964133619 date "2019-07-18" @default.
• W2964133619 modified "2023-10-16" @default.
• W2964133619 title "Carrier Recombination and Diffusion in Wet-Cast Tin Iodide Perovskite Layers Under High Intensity Photoexcitation" @default.
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• W2964133619 doi "https://doi.org/10.1021/acs.jpcc.9b03226" @default.
• W2964133619 hasPublicationYear "2019" @default.
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