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Quantum Molecular Dynamical Calculations of PEDOT 12-Oligomer and its Selenium and Tellurium Derivatives
KTH Royal Institute Technology, Sweden.
KTH Royal Institute Technology, Sweden; University of Gavle, Sweden.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0001-8845-6296
KTH Royal Institute Technology, Sweden; Uppsala University, Sweden.
2017 (engelsk)Inngår i: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 46, nr 5, s. 3071-3075Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present simulation results, computed with the Car-Parrinello 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.

sted, utgiver, år, opplag, sider
SPRINGER , 2017. Vol. 46, nr 5, s. 3071-3075
Emneord [en]
PEDOT; PEDOS; PEDOTe; tellurium; density functional theory; dihedral angle
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-137380DOI: 10.1007/s11664-016-5161-6ISI: 000398937900075OAI: oai:DiVA.org:liu-137380DiVA, id: diva2:1096699
Konferanse
35th International Conference on Thermoelectrics (ICT)
Merknad

Funding Agencies|Vetenskapsradet (VR); Royal Swedish Academy of Sciences (KVA); Knut and Alice Wallenberg Foundation (KAW); Carl Tryggers Stiftelse (CTS); Swedish Energy Agency (STEM); Swedish Foundation for Strategic Research (SSF); Erasmus Mundus Action 2 TARGET II consortium

Tilgjengelig fra: 2017-05-18 Laget: 2017-05-18 Sist oppdatert: 2017-06-14

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