Accurate Ionization Potentials and Electron Affinities of Acceptor Molecules III: A Benchmark of GW Methods

Joseph W. Knight, Xiaopeng Wang, Lukas Gallandi, Olga Dolgounitcheva, Xinguo Ren, J. Vincent Ortiz, Patrick Rinke, Thomas Körzdörfer, Noa Marom*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

95 Citations (Scopus)

Abstract

The performance of different GW methods is assessed for a set of 24 organic acceptors. Errors are evaluated with respect to coupled cluster singles, doubles, and perturbative triples [CCSD(T)] reference data for the vertical ionization potentials (IPs) and electron affinities (EAs), extrapolated to the complete basis set limit. Additional comparisons are made to experimental data, where available. We consider fully self-consistent GW (scGW), partial self-consistency in the Green's function (scGW0), non-self-consistent G0W0 based on several mean-field starting points, and a "beyond GW" second-order screened exchange (SOSEX) correction to G0W0. We also describe the implementation of the self-consistent Coulomb hole with screened exchange method (COHSEX), which serves as one of the mean-field starting points. The best performers overall are G0W0+SOSEX and G0W0 based on an IP-tuned long-range corrected hybrid functional with the former being more accurate for EAs and the latter for IPs. Both provide a balanced treatment of localized vs delocalized states and valence spectra in good agreement with photoemission spectroscopy (PES) experiments.

Original languageEnglish
Pages (from-to)615-626
Number of pages12
JournalJournal of Chemical Theory and Computation
Volume12
Issue number2
DOIs
Publication statusPublished - 9 Feb 2016
MoE publication typeA1 Journal article-refereed

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