Organic solar cells are approaching power conversion efficiencies of other thin-film technologies. However, in order to become truly market competitive, the still substantial voltage losses need to be reduced. Here, the synthesis and characterization of four novel arylamine-based push-pull molecular donors was described, two of them exhibiting a methyl group at the para-position of the external phenyl ring of the arylamine block. Assessing the charge-transfer state properties and the effects of methylation on the open-circuit voltage of the device showed that devices based on methylated versions of the molecular donors exhibited reduced voltage losses due to decreased non-radiative recombination. Modelling suggested that methylation resulted in a tighter interaction between donor and acceptor molecules, turning into a larger oscillator strength to the charge-transfer states, thereby ensuing reduced non-radiative decay rates.

Reducing Non-Radiative Voltage Losses by Methylation of Push–Pull Molecular Donors in Organic Solar Cells / Baisinger, L.; Andres Castan, J. M.; Simon Marques, P.; Londi, G.; Gohler, C.; Deibel, C.; Beljonne, D.; Cabanetos, C.; Blanchard, P.; Benduhn, J.; Spoltore, D.; Leo, K.. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 14:17(2021), pp. 3622-3631. [10.1002/cssc.202100799]

Reducing Non-Radiative Voltage Losses by Methylation of Push–Pull Molecular Donors in Organic Solar Cells

Spoltore D.;
2021

Abstract

Organic solar cells are approaching power conversion efficiencies of other thin-film technologies. However, in order to become truly market competitive, the still substantial voltage losses need to be reduced. Here, the synthesis and characterization of four novel arylamine-based push-pull molecular donors was described, two of them exhibiting a methyl group at the para-position of the external phenyl ring of the arylamine block. Assessing the charge-transfer state properties and the effects of methylation on the open-circuit voltage of the device showed that devices based on methylated versions of the molecular donors exhibited reduced voltage losses due to decreased non-radiative recombination. Modelling suggested that methylation resulted in a tighter interaction between donor and acceptor molecules, turning into a larger oscillator strength to the charge-transfer states, thereby ensuing reduced non-radiative decay rates.
Reducing Non-Radiative Voltage Losses by Methylation of Push–Pull Molecular Donors in Organic Solar Cells / Baisinger, L.; Andres Castan, J. M.; Simon Marques, P.; Londi, G.; Gohler, C.; Deibel, C.; Beljonne, D.; Cabanetos, C.; Blanchard, P.; Benduhn, J.; Spoltore, D.; Leo, K.. - In: CHEMSUSCHEM. - ISSN 1864-5631. - 14:17(2021), pp. 3622-3631. [10.1002/cssc.202100799]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2918804
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