New molecular materials for large area roll-coated organic photovoltaics
Gregory Welch a
a Department of Chemistry, University of Calgary, University Way Northwest, 2975, Calgary, Canada
Proceedings of MATSUS Spring 2026 Conference (MATSUSSpring26)
B2 Strategies to push the efficiency and stability limits of organic photovoltaics at a multiscale
Barcelona, Spain, 2026 March 23rd - 27th
Organizers: Ignasi Burgués and Maria Saladina
Invited Speaker, Gregory Welch, presentation 289
Publication date: 15th December 2025

Polycyclic aromatic molecules, especially perylene diimide based dyes, are widely used as electronic materials in photovoltaic devices.1 Our team at the University of Calgary has been actively developing modified perylene diimides for use in a range of solution processed electronic devices including organic solar cells,2 organic light emitting diodes,3 transistors and sensors,4 electrochromic films,5 and photo/electro cathodes.6 This presentation will detail the design and synthesis of several classes of new molecules for specific use in large area organic photovoltaic devices and modules, primarily as cathode interlayers in both conventional and inverted type cells, but also as non-fullerene acceptors. Structure-property relationships, the formation of functional large area films via slot-die coating using green solvents, and utility both small area devices and flexible modules will be discussed. In addition, this presentation will introduce new ultra-narrow gap molecules for use as electron acceptors.7

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