Dr. Gregory C. Welch Profile

Dr. Gregory C. Welch

Professor at Univ of Calgary

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Proceedings Article | 14 September 2018 Paper

Towards upscaling of organic photovoltaics using non-fullerene acceptors

Audrey Laventure, Cayley Harding, Edward Cieplechowicz, Gregory Welch

Proceedings Volume 10737, 107370H (2018) https://doi.org/10.1117/12.2321146

KEYWORDS: Coating, Organic photovoltaics, Solar cells

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Herein, we present our current efforts on fundamental research towards large area organic photovoltaic devices using nonfullerene acceptors (NFAs). First, we present a short review of the main highlights of the state-of-the art in large-area organic solar cells (OSCs) coating. We then present our guidelines to prepare OSCs in an environmentally friendly way from the synthesis of the organic compounds to the choice of the solvent for the coating solutions and the actual OSCs coating. As a starting point, we paired a perylene diimide (PDI) acceptor, PDI₂-EH, to the donor polymer PBDB-T to compare spin-coated and slot-die coated OSC devices. Considering the poor solubility of this bulk-heterojunction system in non-halogenated solvents, we focused our efforts to slot-die coat the soluble PDI₂-EH acceptor on glass and polyethylene terephthalate (PET) substrates from non-halogenated solvents such as toluene, o-xylenes and anisole. We also explored the influence of different UV/ozone treatments for cleaning the PET substrates. Overall, this study presents practical considerations for laying foundations to proceed with an environmentally responsible upscale of OSC coatings.

Proceedings Article | 14 September 2018 Presentation + Paper

Environment friendly solvent processed, fullerene-free organic solar cells with high efficiency in air

Sergey Dayneko, Arthur Hendsbee, Gregory Welch

Proceedings Volume 10737, 107370N (2018) https://doi.org/10.1117/12.2321704

KEYWORDS: Solar cells, Organic photovoltaics, Solar energy, Polymers, Photovoltaics, Photovoltaic materials, Organic semiconductors, Thin film solar cells

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Fullerene-free organic solar cells (OSCs) have attracted significant interest in the research community over the past few years. Their efficiency has risen rapidly, with multiple reports of record power conversion efficiencies (PCEs) breaching 14%. While encouraging, these performance metrics are often achieved with the utilization of toxic halogenated solvents for the fabrication process, which is less attractive for large-scale manufacturing. Dimeric perylene diimide (PDI) electron transport materials are currently considered amongst the key candidates for the realization of low-cost, highefficiency “green-processed” OSCs. The low-cost synthetic versatility of the PDI skeleton allows for a range of chemical “fine-tuning” and the chromophore has excellent photochemical stability and strong light absorption in the visible region.

This report will detail our research into OSCs using PDI dimers as the electron acceptors and active layer fabrication using non-halogenated solvents. PTB7-Th was chosen as the donor material, owing to its good solubility in nonhalogenated solvents, complementary light absorption and suitable energy level alignment for pairing with our PDI acceptors. Two different PDI dimers having linear and branched alkyl chains are studied.

We have previously shown that PTB7-Th:PDI based solar cells with active layers processed from 2Me-THF, o-xylene, or 1,2,4-trimethylbenzene could reach PCEs from 5-6%. The processing solvent can be extended to toluene with solar cells exhibiting PCEs of 5%. Thus, this work highlights the many processing options for the PTB7-Th / N-annulated PDI dimer active layer combination.

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