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Lessard Research Group - Next Generation Materials for Next Generation Applications

Congrats Trevor! New Publication in J. Mater. Chem A!

New Publication in J. Mater. Chem A!

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Great improvements in the development of organic photovoltaic devices have been reported over the years; however, the overall efficiency and operational lifetimes of the devices must be improved. Maintaining an optimal morphology of the device active layer over time and with exposure to heat is vital to achieving a stable power conversion efficiency (PCE), currently achieved by utilizing cross-linkable ternary additives to lock in the film morphology. However, these additives currently do not contribute to improving the PCE of the device therefore limiting their overall effectiveness. In this study we present a dual functional bis(6-azohexylacrylate) silicon phthalocyanine ((HxN3)2-SiPc) with cross-linking groups and near IR absorption as a ternary additive in poly(3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PC61BM) devices. As an additive, (HxN3)2-SiPc increased the short circuit current density (Jsc) by ≈ 9% due to increased photocurrent generation in the near IR region. In addition, devices utilizing (HxN3)2-SiPc exhibited a 97% PCE retention after thermal ageing at 150 °C for 23h (compared to 47% retention for baseline devices) showing the compound is an effective cross-linker. These findings represent the first example of a multifunctional dye additive in an OPV device that simultaneously broadens the spectral coverage, resulting in added photogeneration, and stabilizes the active layer morphology, resulting in increased PCE retention.

 

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To read the full article visit J. Mater. Chem A.