IFIS - LITORAL   24734
INSTITUTO DE FISICA DEL LITORAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Advanced characterization of Halide Perovskites using the moving grating technique
Autor/es:
FEDERICO VENTOSINOS; JAVIER ALEJANDRO SCHMIDT; ANDERZON F. PALECHOR-OCAMPO; PEDRO HIERREZUELO CARDET
Lugar:
Valencia
Reunión:
Workshop; Online School on Hybrid, Organic and Perovskite Photovoltaics; 2020
Institución organizadora:
Fundació Scito
Resumen:
In recent years, it has been shown that employing pulsed techniques for the characterization of Halide Perovskite (HaPs) thin films may lead to a misestimation of the transport parameters, since the high-power short-time excitation pulses are different from the standard operation conditions of solar cells. This suggests applying steady-state techniques that use intensities closer to one sun. In this talk, I will explain how the steady-state technique known as moving grating technique (MGT), originally introduced to study hydrogenated amorphous silicon, can be used in HaPs thin films. MGT can provide information on the semiconductor type (n-type, p-type or intrinsic), the drift mobilities of both carriers, and their common recombination lifetime. I will start by showing the experimental setup and explaining briefly the working principle of the technique. Then I will provide evidence that the information extracted from the technique is consistent, and I will show the best approach to extract the transport parameters from MGT curves. Following this, I will show results obtained for MaPbI3, FaCsPb(BrI)3 and MaCsPb(BrI)3 thin films (where Ma is methilamonium and Fa is formamidinium), emphasizing the possibilities that this technique offers, such as tracking the material degradation or studying the dependence of electrical parameters upon light intensity, to name a few. Finally, I will show that using a more general theoretical framework, this technique can even be used to gain information on the density of states of the materials.