Bonnes Pratiques de Mesure des Performances des cellules Photovoltaïques

National audienceDans un contexte énergétique tendu, la démonstration de solutions technologiques alternatives efficaces constitue un enjeu majeur. Dans le domaine du photovoltaïque, les filières émergentes (cellules organiques et hybrides) promettent de belles perspectives, avec notamment des rendements pour la première fois supérieurs à 20% démontrés en 2014. Néanmoins, la compétition au niveau international s’accompagne parfois d’annonces de performances parfois mal évaluées, en raison de protocoles de caractérisation inadaptés ou éloignés des standards.Dans ce contexte, il s’avère important de rappeler les méthodes et protocoles adaptés à la caractérisation des performances photovoltaïques, notamment à l’échelle des laboratoires. Au cours de l’exposé, je décrirais ainsi les bonnes pratiques de caractérisation des rendements de conversion de puissance sous éclairement solaire standard, en abordant la problématique de calibration des simulateurs solaires et de la correction spectrale. La mesure des rendements quantiques externes (EQE ou IPCE) et internes (IQE) sera aussi abordée

Improving/Boosting perovskite solar cells performance by using high quality TiO2/graphene-based nanocomposites as electron transport layer

International audienceIn the context of energy transition, development of efficient and cost-effective solar cells is a major objective to establish an optimal energy mix. The 3 rd generation of photovoltaic cells emerged to develop high efficient and low-cost cells combining the use of abundant materials and easy processes. Among them, photovoltaic cells based on perovskite materials demonstrated several significant advances with power conversion efficiencies up to 22% [1][2]. Nevertheless, efforts remain to be performed to improve the charge generation and collection of this kind of cell. Titanium dioxide mesoporous layer, while remaining an important component for perovskite structuration and electron transport in high efficiency devices, can indeed still promote charge trapping and recombination. As carbon nanostructures are good electron transporters, the use of TiO2/graphene nanocomposites seems to be a relevant strategy to reduce recombination phenomena and thus improve electron collection [3]. To achieve high quality of nanocomposites presenting well-controlled physical properties suitable for efficient and stable solar cells, we use the singular technique of laser pyrolysis, which enables to synthetize nanoparticles in a single step with a continuous flow. Attention is payed to the materials properties and their role and effect within solar cells. Tests were conducted with a MAPI-Cl perovskite deposited in a single-step following a reported procedure [4]. Our first results show a better electron injection efficiency from the perovskite to the mesoporous TiO2 layer 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 % for these devices 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 layer

Multifunctional derivatives of dimethoxy-substituted triphenylamine containing different acceptor moieties

This project has received funding from the Research Council of Lithuania (LMTLT), Agreement No. [S-LZ-19-2]. This research was funded by the Région Centre, the Tunisian ministry of research, University of Monastir and the French ministry of Higher Education and Research. J. Bouclé would like to thank the Sigma-Lim LabEx environment for financial supports, and the PLATINOM facility at XLIM laboratory regarding device fabrication and characterizations. DG acknowledges the Lithuanian Academy of Sciences for the financial support.Two compounds, having dimethoxy-substituted triphenylamino groups and fragments of cyanoacrylic acid or rhodanine-3-acetic acid were prepared and characterized. Their optical, photophysical, thermal, electrochemical, photoelectrical and nonlinear optical properties were investigated. Both derivatives showed ability of glass-formation with glass transition temperatures of 83 and 61 °C. They showed comparable ionization potential values of ca. 5.20 eV. The compounds showed Kerr and two photon absorption effects. The dye containing a rhodanine-3-acetic acid fragment, namely 2-((E)-5-(4-(diphenylamino)benzylidene)-tetrahydro-4-oxo-2-thioxothiophen-3-yl)acetic acid, exhibited a promising power conversion efficiency of 2.09% in dye-sensitized solar cells using the spiro-OMeTAD as hole transporting compound.Research Council of Lithuania Agreement No. [S-LZ-19-2]; Région Centre; Tunisian ministry of research; University of Monastir; French ministry of Higher Education and Research; Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART

Interactions (polymers conjugués/sensibilisateurs semi-conducteurs) pour cellules solaires sensibilisées solides à hautes performances

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Généralités et métrologie PV

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Des oxides métalliques aux pérovskites halogénées : Aperçu des dispositifs optoélectroniques hybrides à XLIM

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Matériaux pérovskites pour la conversion photovoltaïque : vers les performances, la stabilité, et le bas coût

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Dispositifs Pérovskites

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3 questions à…

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Potentialités du photovoltaïque hybride

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