Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Perovskite solar cells (PSCs) at the moment are demonstrating efficiencies comparable to that of the best Si-based devices, and their further progress is strongly dependent on the available organic hole transporting materials (HTMs). Currently, the highest published certified efficiency of 25.7% was achieved [1].
In this work, a series of small organic molecules, with introduced vinyl groups, as hole transporting materials were synthesized and investigated. The synthetic route to obtain cross-linkable compounds from fluorene as a starting material for final compounds was chosen because of its commercial availability and relatively low price. It was shown that new materials undergo thermal polymerization and are forming solvent-resistant 3D films. The cross-linking process for monomers was completed after annealing for roughly 60 minutes. The hole mobilities of cross-linked films were measured, the results indicate that charge transport properties of compounds largely improve after polymerization.
As a proof of concept, novel polymerized materials have proven to have more successful application in inverted architecture PSCs than compared to unpolymerized layers, which demonstrates the potential of dopant-free cross-linkable HTMs.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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