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New HTL materials enable bridging the gap between the latest lab-level and production-level OPVs

New HTL materials enable bridging the gap between the latest lab-level and production-level printed OPV performance: In this concise 5-min presentation, Nicolas Bouchard first shows the historical rise of OPV efficiencies from 2.5% in 2000 to >18% now, showing how evolution in materials has driven this rise (P3HT: PCBM --> emergence of push-pull polymers (PPP) --> rise of non-fullerene acceptors (NFAs)---> novel PPP and NFA).

He then reveals the large gap between the best lab results and the best production level results with the highest industry-scale results being <8% !!

One key factor holding back the efficiency of production-level OPVs is the unavailablity of a hole transport layer (HTL) compatible with the latest OPV donor and acceptor materials. This is because the latest novel donor and acceptor materials have wider bandgaps, thereby creating a large energy barrier with the common traditional HTL materials: PEDOT. This acts against charge injection and lowers efficiency.


Thus, to get the best from the latest PPPs and NFAs in industry-scale processes, one requires an HTL material in a non halogenated solvent with a deep work function which can be printed in ambient conditions and which yields uniform thick (>100nm) layers.


Brilliant Matters has developed such a material. Here, it is shown how this novel printable deep HTL achieves results equivalent to MoO3 (best evaporated material) when used with PTQ10 and NFA.

This is an important step in further development and industrialization of organic photovoltaics

to learn more about this technology and hear the latest from Brilliant Matters, please join us onsite in Eindhovne (the Netherlands) on 12-13 OCT 2022

https://www.techblick.com/electronicsreshaped




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