The Effect of Conjugated Nitrile Structures as Acceptor Moieties on the Photovoltaic Properties of Dye-Sensitized Solar Cells: DFT and TD-DFT Investigation

التفاصيل البيبلوغرافية
العنوان:	The Effect of Conjugated Nitrile Structures as Acceptor Moieties on the Photovoltaic Properties of Dye-Sensitized Solar Cells: DFT and TD-DFT Investigation
المؤلفون:	Maha J. Tommalieh, Abdulaziz I. Aljameel, Rageh K. Hussein, Khalled Al-heuseen, Suzan K. Alghamdi, Sharif Abu Alrub
المصدر:	International Journal of Molecular Sciences, Vol 25, Iss 13, p 7138 (2024)
بيانات النشر:	MDPI AG
سنة النشر:	2024
المجموعة:	Directory of Open Access Journals: DOAJ Articles
مصطلحات موضوعية:	nitrile structures, D-A-A organic dye, DFT, TD-DFT, UV–vis absorption spectra, photovoltaic properties, Biology (General), QH301-705.5, Chemistry, QD1-999
الوصف:	A major challenge in improving the overall efficiency of dye-sensitized solar cells is improving the optoelectronic properties of small molecule acceptors. This work primarily investigated the effects of conjugation in nitriles incorporated as acceptor moieties into a newly designed series of D-A-A dyes. Density functional theory was employed to specifically study how single–double and single–triple conjugation in nitriles alters the optical and electronic properties of these dyes. The Cy-4c dye with a highly conjugated nitrile unit attained the smallest band gap (1.80 eV), even smaller than that of the strong cyanacrylic anchor group (2.07 eV). The dyes lacking conjugation in nitrile groups did not contribute to the LUMO, while LUMOs extended from donors to conjugated nitrile components, facilitating intramolecular charge transfer and causing a strong bind to the film surface. Density of state analysis revealed a considerable impact of conjugated nitrile on the electronic properties of dyes through an effective contribution in the LUMO, exceeding the role of the well-known strong 2,1,3-benzothiadiazole acceptor unit. The excited state properties and the absorption spectra were investigated using time-dependent density functional theory (TD-DFT). Conjugation in the nitrile unit caused the absorption band to broaden, strengthen, and shift toward the near-infrared region. The proposed dyes also showed optimum photovoltaic properties; all dyes possess high light-harvesting efficiency ( L H E ) values, specifically 96% for the dyes Cy-3b and Cy-4c, which had the most conjugated nitrile moieties. The dyes with higher degrees of conjugation had longer excitation lifetime values, which promote charge transfer by causing steady charge recombination at the interface. These findings may provide new insights into the structure of conjugated nitriles and their function as acceptor moieties in DSSCS, which may lead to the development of extremely effective photosensitizers for solar cells.
نوع الوثيقة:	article in journal/newspaper
اللغة:	English
تدمد:	1422-0067 1661-6596
Relation:	https://www.mdpi.com/1422-0067/25/13/7138; https://doaj.org/toc/1661-6596; https://doaj.org/toc/1422-0067; https://doaj.org/article/4337c054825547a9bf26a3c8ff8290ae
DOI:	10.3390/ijms25137138
الاتاحة:	https://doi.org/10.3390/ijms25137138 https://doaj.org/article/4337c054825547a9bf26a3c8ff8290ae
رقم الانضمام:	edsbas.A216EFC0
قاعدة البيانات:	BASE

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الوصف
تدمد:	14220067 16616596
DOI:	10.3390/ijms25137138