Quantum Molecular Dynamical Calculations of PEDOT 12-Oligomer and its Selenium and Tellurium Derivatives
2016 (English)In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186XArticle in journal (Refereed) Epub ahead of print
We present simulation results, computed with the CarâParrinello molecular dynamics method, at zero and ambient temperature (300 K) for poly(3,4-ethylenedioxythiophene) [PEDOT] and its selenium and tellurium derivatives PEDOS and PEDOTe, represented as 12-oligomer chains. In particular, we focus on structural parameters such as the dihedral rotation angle distribution, as well as how the charge distribution is affected by temperature. We find that for PEDOT, the dihedral angle distribution shows two distinct local maxima whereas for PEDOS and PEDOTe, the distributions only have one clear maximum. The twisting stiffness at ambient temperature appears to be larger the lighter the heteroatom (S, Se, Te) is, in contrast to the case at 0 K. As regards point charge distributions, they suggest that aromaticity increases with temperature, and also that aromaticity becomes more pronounced the lighter the heteroatom is, both at 0 K and ambient temperature. Our results agree well with previous results, where available. The bond lengths are consistent with substantial aromatic character both at 0 K and at ambient temperature. Our calculations also reproduce the expected trend of diminishing gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital with increasing atomic number of the heteroatom.
Place, publisher, year, edition, pages
Aromatization; Atoms; Charge distribution; Density functional theory; Molecular dynamics; Molecular orbitals; Selenium; Tellurium; Tellurium compounds; Temperature, Dynamical calculations; Highest occupied molecular orbital; Lowest unoccupied molecular orbital; Molecular dynamics methods; PEDOS; PEDOT; PEDOTe; Poly-3, 4-ethylenedioxythiophene, Dihedral angle
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:hig:diva-23282DOI: 10.1007/s11664-016-5161-6ScopusID: 2-s2.0-85001037983OAI: oai:DiVA.org:hig-23282DiVA: diva2:1064247
cited By 0; Article in Press2017-01-122017-01-112017-01-16Bibliographically approved