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BSE@ GW Prediction of Charge Transfer Exciton in Molecular Complexes: Assessment of Self-Energy and Exchange-Correlation Dependence.

Sampreeti BhattacharyaJiachen LiWeitao YangYosuke Kanai
Published in: The journal of physical chemistry. A (2024)
The Bethe-Salpeter equation using the GW approximation to the self-energy (BSE@ GW ) is a computationally attractive method for studying electronic excitation from first principles within the many-body Green's function theory framework. We examine its dependence on the underlying exchange-correlation (XC) approximation as well as on the GW approximation for predicting the charge transfer exciton formation at representative type-II interfaces between molecular systems of tetrachloro-1,2-benzoquinone (TCBQ) and acene derivatives. For the XC approximation, we consider several widely used generalized gradient approximation (GGA) and hybrid GGA functionals. For the GW self-energy approximation, we examine the recently proposed renormalized singles approach by Yang and coauthors [ J. Phys. Chem. Lett. 2019 , 10 (3), 447-452; J. Chem. Theory Comput. 2022 , 18, 7570-7585] in addition to other commonly employed approximated GW schemes. We demonstrate a reliable prediction of the charge transfer exciton within the BSE@ GW level of theory.
Keyphrases
  • energy transfer
  • single molecule
  • cross sectional