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    Designing new donors organic compounds with IDIC core for photovoltaic application
    (Elsevier GmbH, 2022) Nebbach, Diae; Agda, Fatima; Lakhlifi, Tahar; Ajana, Mohammed Aziz; Kaya, Savas; Siddique, Farhan; Lgaz, Hassane
    To search for high-performance ?-conjugated donor molecules used in organic solar cells with heterojunction, Density Functional Theory (DFT) and TD-DFT using B3LYP/6–31 G(d,p) method were used to design and characterize three donor molecules (A2?A1?D?A1?A2) type derived from IDIC (reference) based on indacinodithiophene. These donor molecules were designed by adding the acceptor groups: 2-methyl benzimidazole forming (D1), 2-methyl benzotriazole forming (D2), 2–1–3 benzothiadiazole forming (D3) to both ends of the reference compound IDIC. Their geometric, optoelectronic properties and quantum chemical parameters were examined. The energy driving force (?ELUMO), the exciton binding energy (EB), the reorganization energy (RE) and the open-circuit voltage (Voc) were also calculated to give a basic insight into the performance of their cells. Because of their wide and red-shifted absorption, low (EB), low (RE) and high (Voc), the findings showed that these materials can be excellent candidates for photovoltaic applications. © 2022 Elsevier GmbH
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    Non-fullerene acceptor IDIC based on indacinodithiophene used as an electron donor for organic solar cells: A computational study
    (Elsevier, 2022) Nebbach, Diae; Agda, Fatima; Kaya, Savas; Siddique, Farhan; Lakhlifi, Tahar; Ajana, Mohammed Aziz; Bouachrine, Mohammed
    In the present paper, a computational study was performed on a planar non-fullerene acceptor (A-D-A) type based on indacenodithiophene (noted IDIC) which is widely used in the fabrication of organic solar cells. The structural and optoelectronic properties were studied using the Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) approaches with different functionals, such as B3LYP, B3PW91, MPW1PW91. The optoelectronic properties such as HOMO and LUMO energy levels, energy gap, lambda(max) were determined and compared with experimental results reported. Charge transfer properties were further characterized through Frontier Molecular Orbitals (FMOs) and Density of States (DOS). Transition density matrix (TDM) and hole&electron isosurface were used to illustrate the behavior of electronic excitation processes as well as the position of electron holes between the donor and acceptor units. In addition, the IDIC compound was tested as an electron donor with the fullerenes and their derivatives as electron acceptors (PCBM). Both electrochemical and photovoltaic properties were investigated and discussed in detailed. The theoretical results indicated that the B3LYP/6-31G(d,p) and its time-dependent counterpart TD-B3LYP/6-31G(d,p) methods are appropriate to predict the optoelectronic properties. The values of the open-circuit voltage (Voc) of IDIC with used acceptors range from 1.165 to 1.665 V. The results of this study showed the high potential of the IDIC compound for integratation into solar cells as an electron donor material and suggested the usefulness of studied materials as promising candidates for photovoltaics. (C) 2021 Published by Elsevier B.V.