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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH FRONT

Electronic and Optical Properties of the Narrowest Armchair Graphene Nanoribbons Studied by Density Functional Methods

Chia-Nan Yeh A C , Pei-Yin Lee A C and Jeng-Da Chai A B D
+ Author Affiliations
- Author Affiliations

A Department of Physics, National Taiwan University, Taipei 10617, Taiwan.

B Center for Theoretical Sciences and Center for Quantum Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.

C These authors contributed equally to this work.

D Corresponding author. Email: jdchai@phys.ntu.edu.tw

Australian Journal of Chemistry 69(9) 960-968 https://doi.org/10.1071/CH16187
Submitted: 25 March 2016  Accepted: 5 May 2016   Published: 26 May 2016

Abstract

In the present study, a series of planar poly(p-phenylene) (PPP) oligomers with n phenyl rings (n = 1–20), designated as n-PP, are taken as finite-size models of the narrowest armchair graphene nanoribbons with hydrogen passivation. The singlet-triplet energy gap, vertical ionization potential, vertical electron affinity, fundamental gap, optical gap, and exciton binding energy of n-PP are calculated using Kohn-Sham density functional theory and time-dependent density functional theory with various exchange-correlation density functionals. The ground state of n-PP is shown to be singlet for all the chain lengths studied. In contrast to the lowest singlet state (i.e., the ground state) of n-PP, the lowest triplet state of n-PP and the ground states of the cation and anion of n-PP are found to exhibit some multi-reference character. Overall, the electronic and optical properties of n-PP obtained from the ωB97 and ωB97X functionals are in excellent agreement with the available experimental data.


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