Your browser doesn't support javascript.
loading
The Effect of Conjugated Nitrile Structures as Acceptor Moieties on the Photovoltaic Properties of Dye-Sensitized Solar Cells: DFT and TD-DFT Investigation.
Tommalieh, Maha J; Aljameel, Abdulaziz I; Hussein, Rageh K; Al-Heuseen, Khalled; Alghamdi, Suzan K; Alrub, Sharif Abu.
Afiliación
  • Tommalieh MJ; Physics Department, Faculty of Science, Taibah University, Madinah 44256, Saudi Arabia.
  • Aljameel AI; Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
  • Hussein RK; Department of Physics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
  • Al-Heuseen K; Department of Applied Science, Ajloun University College, Al-Balqa Applied University, Ajloun 26873, Jordan.
  • Alghamdi SK; Qatar Aeronautical Academy, Doha 4050, Qatar.
  • Alrub SA; Physics Department, Faculty of Science, Taibah University, Madinah 44256, Saudi Arabia.
Int J Mol Sci ; 25(13)2024 Jun 28.
Article en En | MEDLINE | ID: mdl-39000245
ABSTRACT
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 (LHE) 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.
Asunto(s)
Palabras clave

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Energía Solar / Colorantes / Teoría Funcional de la Densidad / Nitrilos Idioma: En Revista: Int J Mol Sci Año: 2024 Tipo del documento: Article País de afiliación: Arabia Saudita

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Energía Solar / Colorantes / Teoría Funcional de la Densidad / Nitrilos Idioma: En Revista: Int J Mol Sci Año: 2024 Tipo del documento: Article País de afiliación: Arabia Saudita