Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 35, Pages 21270-21282Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp02228a
Keywords
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Funding
- National Natural Science Foundation of China [21875111, 51861145401]
- Xiamen University
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) [HRTP-[2022]-45]
- Nanjing University of Science and Technology (NJUST)
- Nanjing Municipal Government (NMG)
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This study evaluates the effect of Hartree-Fock exact exchange on the calculation of maximum absorption wavelengths and vertical excitation energies using time-dependent density functional theory. The results show that different methods with varying HFX ratios have different performances, while methods with the same ratio perform similarly. Additionally, the APF and APFD methods have the smallest deviations for all compounds.
The acceptor-donor-acceptor structured fused-ring electron acceptors (FREAs) have piqued interest for organic solar cells. We herein employ time-dependent density functional theory to evaluate the effect of Hartree-Fock exact exchange (HFX) on the performance of 16 global hybrid functionals for computing the maximum absorption wavelengths (lambda(ver-theo)) and the vertical excitation energies (Ever-theo) of 34 molecules. We customize the HFX ratio in the functionals used to perform an in-depth analysis of its impact on the Ever-theo values. The computed lambda(ver-theo) values strictly follow an inverse proportionality to the HFX percentage. The performance of the methods with the same ratio of HFX is almost identical, such as B3LYP, B3PW91, and mPW3PBE containing 20% HFX. The performance enhances with a relatively higher HFX ratio of 21% in X3LYP, B971, B972, and 22% in B98 giving smaller deviations. APF and APFD containing 23% HFX provide the smallest deviations for all compounds, with a mean signed error limited to 0.02 eV and a mean absolute error (MAE) of 0.06 eV. The performance drops using M06 and M05 with comparatively higher HFX ratios providing MAE values of 0.07 eV and 0.1 eV, respectively. M06-2X with 54% HFX provides the largest MAE value of 0.35 eV. The lowest obtained MAE is 0.06 eV at 23 to 25% HFX in most of the functionals considered in this study, suggesting that these are the optimal values for the prediction of excitation energies of FREAs. It has also been found that global hybrids seem to be more efficient for larger-sized molecules with a smaller bandgap.
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