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Effect of the substituent group in p-X-benzylidenemalononitrile on the optical and the electrical parameters of π-conjugated polymers based devices

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Abstract

The effects of the substituent in p-substituent-benzylidenemalononitrile small molecules have been investigated. We found that the replacement of cyano group in the molecule (M1) by a nitro group (M2) reduces the optical and the electrochemical band gap value which is correlated with a red shift in the absorption and photoluminescence spectra. The insertion of both molecules in P3HT and PCDTBT polymers showed that the quenching parameter efficiency increase from 42 to 71% and from 51 to 64%, respectively. We conclude that M2 is an efficient quencher in P3HT. Electrical measurements in dark showed a diode behaviour for all devices. The effective hole mobility μeff was calculated and shows an enhancement in the case of ITO/P3HT:M2/Al. The calculated values are comparable to those in the literature.

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Acknowledgements

The authors would like to thank Deanship of Scientific Research at Majmaah University for supporting this work.

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  1. Shazalia Mahmoud Ahmed Ali

    Present address: Department of Chemistry, Faculty of Science Al-Zulfi, Majmaah University, Majmaah, 11952, Saudi Arabia

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    Ali, S.M.A. Effect of the substituent group in p-X-benzylidenemalononitrile on the optical and the electrical parameters of π-conjugated polymers based devices. J Mater Sci: Mater Electron 33, 9448–9454 (2022). https://doi.org/10.1007/s10854-021-07438-5

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