Publication date: 11th March 2026
In recent years, perovskite solar cells have attracted considerable interest due to their high efficiencies (over 27%), lightweight and independence from light quality[1]. However, these cells are sensitive to external conditions such as moisture and oxygen[2], which limits the deployment of this technology on a larger scale. To prevent this degradation, some research has focused on charge transport layers in order to improve their interface with perovskite and act as a protective layer for the latter, thereby improving its stability [3].
In this context, our project aims to developp cross-linkable polymer-based electron transport layers in order to improve the stability and the lifetime of perovskite solar cells. To do so, we designed different molecules based on an alternation of perylene diimide or naphthalene diimide structures (strong electron acceptor units) with a non-conjugated spacer within the chain backbone, instead of lateral chains, to improve the solubility and limit the visible absorbance of our materials.
These materials present good thermal resistance and energy levels that are compatible with those of the active layer. We will show that these materials can be deposited onto the perovskite layer and how the acceptor unit and the chain length influence their physico-chemical properties and photovoltaic characteristics of the developed devices. Interestingly, this new class of materials presents a high structuration leading to decent conductivity. Finally, the integration of reactive end-chains to cross-link these materials to make them more resistant to external conditions while maintaining good electron extraction capacity, will be presented.
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