A scaling law for the time derivative of TR-PL allows for a quantitative assessment of radiative and nonradiative recombination parameters of perovskite materials

Guillaume Vidon; Stefania Cacovich; Marie Legrand; Daniel Ory; Daniel Suchet; Jean-Baptiste Puel; Jean-François Guillemoles

doi:10.1117/12.2624382

30 May 2022 A scaling law for the time derivative of TR-PL allows for a quantitative assessment of radiative and nonradiative recombination parameters of perovskite materials

Guillaume Vidon, Stefania Cacovich, Marie Legrand, Daniel Ory, Daniel Suchet, Jean-Baptiste Puel, Jean-François Guillemoles

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Proceedings Volume PC12150, Photonics for Solar Energy Systems IX; PC1215008 (2022) https://doi.org/10.1117/12.2624382
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Perovskite-based solar cells are the subject of intense study today because of their promise in terms of high efficiency, easy and low-cost fabrication. To gain insight on the behavior of carriers inside the perovskite layer, time resolved photo luminescence (TR-PL) and time resolved fluorescence imaging (TR-FLIM) are used. However, owing to their long lifetimes (~1µs) and slow diffusion (D~1e-2cm2s-1) the acquired signals require specific care for interpretation. In a previous work, we showed how these properties can be exploited to derive a scaling-law for the normalized time derivative of the TR-PL signal just after the laser pulse 1/tau. This scaling links the derivative to the material parameters: interface and bulk non radiative recombination, radiative recombination, and diffusion. Our previous focus showed the impact of the laser fluence on the derivative and its use to obtain among others the external radiative recombination coefficient. In this work we extend the possibility of our previous technique to separate surface and bulk contributions using the impact of the laser wavelength on the scaling of 1/tau through its impact on the spatial distribution of photogenerated carriers. The absorption coefficient of the material at the laser wavelength plays a crucial role in the scaling. We use theoretical computations as well as drift-diffusion simulation to analyze the range of applicability of our technique. We apply experimentally our methodology on perovskite samples with a pulsed laser of varying wavelength. The aim is to determine quantitatively the bulk, front and bottom surface non radiative. We show experimental validation of the scaling on perovskite material and analyze how it can be combined with drift-diffusion simulation. We investigate both interfaces (bottom and front) by varying the illumination side and show how this technique allows for the quantitative comparison of non-radiative recombination at both interfaces. We discuss the experimental uncertainty.

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Guillaume Vidon, Stefania Cacovich, Marie Legrand, Daniel Ory, Daniel Suchet, Jean-Baptiste Puel, and Jean-François Guillemoles "A scaling law for the time derivative of TR-PL allows for a quantitative assessment of radiative and nonradiative recombination parameters of perovskite materials", Proc. SPIE PC12150, Photonics for Solar Energy Systems IX, PC1215008 (30 May 2022); https://doi.org/10.1117/12.2624382

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KEYWORDS

Perovskite

Absorption

Interfaces

Pulsed laser operation

Diffusion

Luminescence

Glasses

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