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          Institute: MPI für bioanorganische Chemie     Collection: MPI für bioanorganische Chemie     Display Documents



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ID: 733833.0, MPI für bioanorganische Chemie / MPI für bioanorganische Chemie
Size Dependence of Electrical Conductivity and Thermoelectric Enhancements in Spin-Coated PEDOT:PSS Single and Multiple Layers
Authors:Andrei, Virgil; Bethke, Kevin; Madzharova, Fani; Beeg, Sebastian; Knop-Gericke, Axel; Kneipp, Janina; Rademann, Klaus
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Advanced Electronic Materials
Journal Abbrev.:Adv. Electron. Mater.
Volume:3
Issue / Number:2
Start Page:1600473-1
End Page:1600473-8
Sequence Number of Article:1600473
Review Status:Internal review
Audience:Experts Only
Abstract / Description:This work reveals that the electrical conductivity s of a poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT: PSS) film can be significantly increased by spin-coating multiple thin layers onto a substrate. Generally, s can be improved by more than fourfold for multiple layers, as compared to a single thicker one. A gradual enhancement is observed for pristine PEDOT: PSS films (up to 2.10 +/- 0.26 S cm(-1) for five-layered films), while a plateau in s at around 200 S cm(-1) is reached after only three layers, when using a PEDOT: PSS solution with 5 vol% dimethyl sulfoxide. By contrast, only a small change in s is observed for single layers of varying thickness. Accordingly, the thermoelectric power factor is also increased by up to 3.4 times for the multiple layers. Based on atomic force microscopy, X-ray photoelectron spectroscopy, UV-vis, and Raman spectroscopy measurements, two mechanisms are also proposed, involving an increase in percolation by inclusion of smaller grains within the existing ones, respectively, a reorganization of the PEDOT: PSS chains. These findings represent a direct strategy for enhancing the thermoelectric performance of conductive polymer films without additional reagents, while the mechanistic insights explain existing literature results.
Comment of the Author/Creator:Date: 2017, FEB 2017
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N. N.
Affiliations:MPI für bioanorganische Chemie
Identifiers:ISI:000394901900016 [ID No:1]
ISSN:2199-160X [ID No:2]
DOI:10.1002/aelm.201600473 [ID No:3]
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