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Water-based organic semiconductors colloidal dispersions for photovoltaics – WATER-PV

WATER-PV: Water-based organic semiconductors colloidal dispersions for photovoltaics

The fabrication of organic photovoltaic (OPV) devices implies the use of halogeno and/or aromatic solvent to process the active layer. In order to make this technology cleaner, it is necessary to move to eco-friendly solvent and water is the best one. This project aims at developing rationally-designed water-based organic semiconductors colloidal dispersions inks.

Main issues and general objective

Although water-based organic semiconductors inks have already been developped and successfully applied in the OPV field, devices fabricated using water-based colloidal dispersions still present lower efficiencies than control devices fabricated from halogeno and/or aromatic solvents. The reason behind these limitations can come from different origins: the presence of surfactant, inappropriate morphology of the nanoparticles and/or of the active layer. These different parameters can affect the charge carrier transport properties and exciton dissociation, and, therefore, will impact the photovoltaic properties. In order to develop organic photovoltaic solar cells with water-based inks, it is necessary to establish structure-properties relationship between the organic semiconductors NP morphology on the optoelectronic properties of the devices.<br />WATER-PV aims at overcoming these limitations and fabricating state-of-the-art OPV devices using water-based colloidal dispersions. To do so, we will develop a bottom-up approach starting from the precise control of the NP size and morphology.

We are working on the elucidation of the relationship between the morphology and the optoelectronic properties, first at the nanoparticle scale and then on NP assemblies (thin films). The understanding of the charge transport in those structure will guide the development of active layers with the required characteristics (high hole and electron mobilities, balanced charge transport, high exciton dissociation rate). Finally, OPV devices will be fabricated and their photovoltaic properties will be correlated with the electronic characteristics of the active layer.
To summarize, the WATER-PV project aims at establishing a clear understanding between the NP and NP assembly characteristics (size, morphology, composition) and the electronic properties of the final OPV devices. This knowledge will guide us to develop highly efficient OPV devices from water-based dispersions.

Under investigation

Under investigation

« Organic semiconductor colloids: From the knowledge acquired in photovoltaics to the generation of solar hydrogen fuel »
N. Holmes, S. Chambon, A. Holmes, X. Xu, K. Hirakawa, E. Deniau, C. Lartigau-Dagron, A. Bousquet
Current Opinion in Colloid & Interface Science, Vol. 56, p. 101511 (2021)
hal.archives-ouvertes.fr/hal-03418784v1

« Environmentally Friendly Organic Photovoltaics »
H. Laval, G. Wantz, S. Chambon
Poster, Les Houches School of Physics, Les Houches (France), 3-8 April 2022

« Fabrication de nanoparticules organiques semiconductrices par micro/milli fluidique »
G. Bonfante, A. Genot, S.H. Kim, S. Chambon
Poster, Journées Francophones de la Recherche, Online, 10/12/2021

« Fabrication of semiconducting nanoparticles assisted by 3D printed millifuidic »
G. Bonfante, A. Genot, S.H. Kim, S. Chambon
Oral, NextPV mini-symposium 2022, Online, 10/05/2022

The fabrication of organic photovoltaic (OPV) devices implies the use of halogeno and/or aromatic solvent to process the active layer. In order to make this technology cleaner, it is necessary to move to eco-friendly solvent and water is the best one. The most common way to develop water-based inks is to formulate organic semiconductors colloidal dispersions. Although this technique has already been successfully applied in the OPV field, devices fabricated using water-based colloidal dispersions still present lower efficiencies than control devices fabricated from halogeno and/or aromatic solvents. The reason behind these limitations can come from different origins: the presence of surfactant, inappropriate morphology of the nanoparticles and/or of on the dense active layer thin film. These different parameters can affect the charge carrier transport properties and exciton dissociation, and, therefore, will impact the photovoltaic properties. However no clear understanding of the impact of organic semiconductors NP morphology on the optoelectronic properties of the final device has been reported yet.
WATER-PV aims to overcome these limitations and fabricate state-of-the-art OPV devices using water-based colloidal dispersions. To do so, we will develop a bottom-up approach starting from the precise control of the NP size and morphology. We will then work on the elucidation of the relationship between the morphology and the optoelectronic properties, first at the nanoparticle scale and then on NP assemblies (thin films). The understanding of the charge transport in those structure will guide the development of active layers with the required characteristics (high hole and electron mobilities, balanced charge transport, high exciton dissociation rate). Finally, OPV devices will be fabricated and the photovoltaic properties will be correlated with the electronic characteristics of the active layer.
To summarize, the WATER-PV project aims at establishing a clear understanding between the NP and NP assembly characteristics (size, morphology, composition) and the electronic properties of the final OPV devices. This knowledge will guide us to develop highly efficient OPV devices from water-based dispersions.

Project coordination

Sylvain Chambon (Laboratory for Integrated Micro Mechatronics Systems)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IMS LABORATOIRE D'INTEGRATION DU MATERIAU AU SYSTEME
LIMMS Laboratory for Integrated Micro Mechatronics Systems

Help of the ANR 336,398 euros
Beginning and duration of the scientific project: October 2020 - 42 Months

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