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Optical Properties of Organic/Inorganic Perovskite Microcrystals through the Characterization of Fabry–Pérot Resonances

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Abstract

A precise knowledge of the optical properties, specifically the refractive index, of organic/inorganic perovskites, is essential for pushing forward the performance of the current photovoltaic devices that are being developed from these materials. Here we show a robust method for determining the real and the imaginary part of the refractive index of MAPbBr₃ thin films and micrometer size single crystals with planar geometry. The simultaneous fit of both the optical transmittance and the photoluminescence spectra to theoretical models defines unambiguously the refractive index and the crystal thickness. Because the method relies on the optical resonance phenomenon occurring in these microstructures, it can be used to further develop optical microcavities from perovskites or from other optical materials.

How to cite

Initials first

F. Ramiro-Manzano, R. García-Aboal, R. Fenollosa, S. Biasi, I. Rodriguez, P. Atienzar and F. Meseguer. Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry–Pérot resonances. Dalton Transactions 49(36), 12798–12804 (2020). DOI: 10.1039/D0DT02254C.

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Ramiro-Manzano, F., García-Aboal, R., Fenollosa, R., Biasi, S., Rodriguez, I., Atienzar, P., & Meseguer, F. (2020). Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry–Pérot resonances. Dalton Transactions, 49(36), 12798–12804. https://doi.org/10.1039/D0DT02254C

Article access and reuse

The Version of Record is available from the Royal Society of Chemistry and is not hosted on this website. RSC authors retain the right to reuse their own figures on personal websites when the original article is properly acknowledged. The four figures below are complete, unmodified compositions extracted from the article PDF.

Figures

Figure 1. Schematic representation of the OT (a) and PL (b) experiments. (b1) Effect of the pump and PL propagation losses over the forward PL response. Here, the contributions to the emission of two slices of the active material, excited by P1 and P2 pump intensities, are highlighted. (c) Calculated transmittance (black curve) of an asymmetrical thin film cavity (r₁₂ = 0.2, r₂₃ = 0.6, nᵣ = 2.4). Three spectral regions corresponding to three different scenarios, one with moderate propagation losses (a = 0.44, red colour background) and another without losses (a = 1, blue colour background) and a transition region between them with intermediate losses (white colour background) have been considered. The transmittance T is limited by T+ (blue line) and T− (green line). These two limits comprise an average transmission Tav (dashed red line).

© 2020 The Royal Society of Chemistry. Source: F. Ramiro-Manzano et al., Dalton Transactions 49(36), 12798–12804 (2020), DOI 10.1039/D0DT02254C. Reproduced by the authors in accordance with RSC author reuse rights.

Figure 2. Transmittance (blue line) and Normalized PL (red line) spectra for different objectives: N.A. 0 (a), N.A. 0.26 (b), N.A. 0.4 (c), N.A. 0.5 (d) for a perovskite layer of 3.96 μm thick. The refractive index and extinction dispersion have been extracted from the fit of experimental data (see Fig. 4).

© 2020 The Royal Society of Chemistry. Source: F. Ramiro-Manzano et al., Dalton Transactions 49(36), 12798–12804 (2020), DOI 10.1039/D0DT02254C. Reproduced by the authors in accordance with RSC author reuse rights.

Figure 3. Calculated (a) Transmittance and (b) Normalized PL spectra of a MAPbBr₃ thin film as a function of the layer thickness for a collection objective of N.A. = 0.26 where (a1)–(a4) and (b1)–(b4) represent respectively 1, 2.5, 4 and 20.85 μm sample thickness. The refractive index and extinction dispersion have been extracted from the fit of experimental data (see Fig. 4).

© 2020 The Royal Society of Chemistry. Source: F. Ramiro-Manzano et al., Dalton Transactions 49(36), 12798–12804 (2020), DOI 10.1039/D0DT02254C. Reproduced by the authors in accordance with RSC author reuse rights.

Figure 4. (a) Optical microscopy image of the measured MAPbBr₃ crystal microcavity (square structure at the center of the image). (b) and (c) Experimental data and fitted curves for the OT and the PL spectra respectively. Resonant modes are indicated on top of their resonance peak by their mode-order, m. (d) Real and (e) imaginary part of the fitted refractive index and that of ref. 27 for comparison. (e) Finesse and (f) Quality Factor for all of the identified modes. The lines act as a guide to the eye.

© 2020 The Royal Society of Chemistry. Source: F. Ramiro-Manzano et al., Dalton Transactions 49(36), 12798–12804 (2020), DOI 10.1039/D0DT02254C. Reproduced by the authors in accordance with RSC author reuse rights.

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