TiO2/graphene-based nanocomposites for perovskites solar cells: synthesis and properties

Aurélie Habert 1 Nathalie Herlin-Boime 1 Raphaëlle Belchi 1 Johann Bouclé 2, *
* Auteur correspondant
1 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Since 2012, hybrid solar cells based on perovskite materials demonstrated several significant advances, with power conversion efficiencies now over 22%, attracting strong interest within the scientific community [1][2]. Still, efforts remain to be performed to improve photo-current extraction, especially concerning the development of efficient and reliable charge transporting electrodes and selective contacts. Titanium dioxide mesoporous layer, while remaining an important component for perovskite structuration and electron transport in high efficiency devices, can however still promote charge trapping and recombination. To reduce these phenomena and improve electron collection, our strategy consists in using the excellent conductivity properties of graphene materials through its incorporation within the TiO2 electrode. Here, we combine specific know-hows on both perovskite solar cells processing and production of nanoscaled materials by laser pyrolysis. Our aim is to develop high quality TiO2 /graphene nanocomposites with wellcontrolled physical properties for an optimal energy conversion. We pay particular attention to material characterizations such as morphological and structural analysis as well as physical properties evaluation of the nanocomposites and their role and effects within solar cells. Our first results show a better electron injection efficiency with graphene, observed through steady-state photoluminescence spectroscopy. This tendency has been reinforced by devices performance that show larger photocurrents and smaller series resistance under standard illumination. More generally an increase in power conversion efficiency from 14.1 % to 15.1 % is reached for perovskite solar cells containing graphene in the mesoporous layer, demonstrating the benefit of the laser pyrolysis process for the production of high quality electron transport laye
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https://hal-unilim.archives-ouvertes.fr/hal-01812590
Contributeur : Johann Bouclé <>
Soumis le : lundi 11 juin 2018 - 15:41:27
Dernière modification le : mercredi 23 janvier 2019 - 14:39:28

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  • HAL Id : hal-01812590, version 1

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Aurélie Habert, Nathalie Herlin-Boime, Raphaëlle Belchi, Johann Bouclé. TiO2/graphene-based nanocomposites for perovskites solar cells: synthesis and properties. 4ème Journées Pérovskites Halogénées (JPH2018), journées du GDR HPERO, May 2018, Autrans, Grenoble, France. ⟨hal-01812590⟩

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