Determining the Free-Carrier Fraction in 2D Perovskites using Power Dependent Photoluminescence

<p>A study using power-dependent photoluminescence measurements, which allows for a correction of the excitation density and also enables the direct determination of the free carrier fraction x. We focus on two families of Ruddlesden-Popper perovskites, spanning the full range of free carrier fractions vs excitons. Our approach provides a tool for probing the nature of optically excited states in semiconductors and for investigating spatial variations.</p>
<p>The full dataset consists of dataset:</p>
<p>Photoluminescence Time Resolved Power Dependent Measurements of a family of RP perovskite (n=1,2,3,4,5)</p>
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<p>All the data is collected in different flakes of RP perovskites (n=1,2,3,4,5).The data acquisition was done using custom python code and the analysis is performed using custom python code which can be found in GitHub, <a href="https://github.com/phond-uam/Power_Dependent_Photoluminescence">https://github.com/phond-uam/Power_Dependent_Photoluminescence</a></p>
<p>Methodology:</p>
<p>For details about sample preparation and methodology consult the related publication.</p>
<p>Perovskite nanocrystal are prepared using two different cations with a hot solution synthesis approach.</p>
<p>The power dependent photoluminescence measurements are taken using the combination of a picoquant diode laser (LDH-DC-375) and TSCPC module (Picoharp 300). After the laser light is filtered using a single mode fiber the light is directed towards a home-built microscope using a Nikon CFI S Plan Fluor (60x, 0.7 NA) objective. The PL is then sent to an avalanche photodiode (MPD) controlled by the TSCPC module.</p>