Publication date: 5th November 2025
Achieving carbon-neutral energy production requires a rapid increase of electricity production using solar energy. In order to achieve this goal, new generation organic (OPV) and perovskite photovoltaics are needed to: a) enhance the performance of existing, e.g., silicon solar PV and b) allow for the energy- and cost-efficient manufacturing of photovoltaic devices on light-weight flexible substrates.
Both organic and perovskite photovoltaics require the industrial availability of materials with specific electronic, physical and chemical characteristics. The optimization of the properties of unfunctionalized fullerenes (especially C60), available at industrial scale for vapor deposition, will be described.
The selection and design of organic materials to be used in the active layer of high performing OPV and in the interlayers of perovskite PV p-i-n and n-i-p devices will be discussed. The importance of functional groups which are suitable to form self-assembled monolayers (SAM) and/or stabilize the perovskite phase will be assessed. The synthesis of fullerene derivatives, e.g., bearing phosphonic acid or amino-/ammonium-groups but also molecules such as triphenylamines and carbazoles bearing phosphonic or boronic acid with electronic properties suitable for their use as hole transport material (HTM) will be presented.
Fully optimized OPV stacks, i.e., including the electron-transport and hole transport layers (ETL and HTL), in addition, to the active layer will be shown. Device data including thermal and light soaking stability will be reported.
Formulations, containing silver nanowires (AgNW) and/or single-wall-carbon nanotubes (SWCNT), suitable for the deposition of semi-transparent top electrodes will be discussed.
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