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Anderson-Localization and the Mott-Ioffe-Regel Limit in Glassy-Metallic PEDOT

Farka, Dominik and Coskun, Halime and Gasiorowski, Jacek and Cobet, Christoph and Hingerl, Kurt and Uiberlacker, Lisa Maria and Hild, Sabine and Greunz, Theresia and Stifter, David and Sariciftci, Niyazi Serdar and Menon, Reghu and Schoefberger, Wolfgang and Mardare, Cezarina Cela and Hassel, Achim Walter and Schwarzinger, Clemens and Scharber, Markus Clark and Stadler, Philipp (2017) Anderson-Localization and the Mott-Ioffe-Regel Limit in Glassy-Metallic PEDOT. In: ADVANCED ELECTRONIC MATERIALS, 3 (7).

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Official URL: http://dx.doi.org/10.1002/aelm.201700050

Abstract

Conductive polymers represent a rare case in which free-carrier absorption is shifted to the far-infrared-an attractive advantage in light of the requirement of highly transparent conductors across the visible and near-infrared. Unfortunately, prior approaches to doping these polymers-imperative for high conductance-have consistently led to strong localization arising from fluctuating band alignment among polymer chains. Here, this study overcomes this problem of doping-induced Anderson localization for the first time in polymers by developing a new conductive polymer synthesis strategy. This study achieves polymerization and doping simultaneously, thereby using an alternative nonmetal oxidant and thereby avoiding the introduction of excess energy that normally arises from exergonic polymerization. The resulting conductive polymer is the first to provide electron coherence in a metallic polymer thin film. The conductivity reaches a remarkable 3300 S cm(-1) at 1.8 K and the mean electron scattering length a record 330 A. This enhancement drives the glassy metal transition in the vicinity of the Mott-Ioffe-Regel (MIR) limit. The new metallic polymer achieves 10(-2) Omega(-1) figure of merit, making it a contender for transparent conductive contacts previously only accessible using inorganics. The new material offers a uniquely broad transparency window spanning the UV to the mid-infrared.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 05 Aug 2017 07:07
Last Modified: 05 Aug 2017 07:07
URI: http://eprints.iisc.ac.in/id/eprint/57579

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