Dynamic self-stabilization in the electronic and nanomechanical properties of an organic polymer semiconductor

Illia Dobryden, Vladimir V. Korolkov (), Vincent Lemaur, Matthew Waldrip, Hio-Ieng Un, Dimitrios Simatos, Leszek J. Spalek, Oana D. Jurchescu, Yoann Olivier, Per M. Claesson and Deepak Venkateshvaran ()
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Illia Dobryden: KTH Royal Institute of Technology
Vladimir V. Korolkov: MediCity Nottingham
Vincent Lemaur: University of Mons
Matthew Waldrip: Wake Forest University
Hio-Ieng Un: Cavendish Laboratory, University of Cambridge
Dimitrios Simatos: Cavendish Laboratory, University of Cambridge
Leszek J. Spalek: Cavendish Laboratory, University of Cambridge
Oana D. Jurchescu: Wake Forest University
Yoann Olivier: Université de Namur
Per M. Claesson: KTH Royal Institute of Technology
Deepak Venkateshvaran: Cavendish Laboratory, University of Cambridge

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The field of organic electronics has profited from the discovery of new conjugated semiconducting polymers that have molecular backbones which exhibit resilience to conformational fluctuations, accompanied by charge carrier mobilities that routinely cross the 1 cm2/Vs benchmark. One such polymer is indacenodithiophene-co-benzothiadiazole. Previously understood to be lacking in microstructural order, we show here direct evidence of nanosized domains of high order in its thin films. We also demonstrate that its device-based high-performance electrical and thermoelectric properties are not intrinsic but undergo rapid stabilization following a burst of ambient air exposure. The polymer’s nanomechanical properties equilibrate on longer timescales owing to an orthogonal mechanism; the gradual sweating-out of residual low molecular weight solvent molecules from its surface. We snapshot the quasistatic temporal evolution of the electrical, thermoelectric and nanomechanical properties of this prototypical organic semiconductor and investigate the subtleties which play on competing timescales. Our study documents the untold and often overlooked story of a polymer device’s dynamic evolution toward stability.

Date: 2022
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DOI: 10.1038/s41467-022-30801-x

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