Physical aging and charge transport in poly(3‐hexylthiophene). Issue 2 (17th November 2015)

• Record Type: Journal Article
• Authors: Duzhko, Volodimyr V.
• Is Part Of: Physica status solidi. Volume 213:Issue 2(2016:Feb.)
• Page Start: 419
• Page End: 423
• Publication Date: 2015-11-17
• Subjects: charge transport -- mobility -- physical aging -- semicrystalline polymer -- time‐of‐flight technique; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.201532307
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : The bulk charge transport in a series of regioregular poly(3‐hexylthiophene) materials with different molecular weights (MW) has been studied by the time‐of‐flight technique. Three distinct temperature regions with transitions at ∼60 and ∼140 °C in lower MW material (9.6 kDa), and four regions with an additional transition at ∼180 °C in higher MW material (32.3 kDa) are identified in the temperature dependence of charge carrier mobility and the origin of these transitions is discussed. A pronounced effect of physical aging which reveals as a reversible increase of charge mobility is found. Densification of amorphous phase in‐between the nanocrystals, which reduces the potential energy barriers and provides larger charge transfer integrals, is proposed as an origin of the effect.