Influence of β-linkages on the morphology and performance of DArP P3HT-PC61BM solar cells

Nanotechnology
Andrey E RudenkoBarry C Thompson

Abstract

Direct arylation polymerization (DArP) has emerged as a greener and more atom-efficient alternative to Stille polymerization. Despite the attractiveness of this method, DArP is known to produce β-linkages in polymers, which have β-protons available for activation. Here, we report the influence of the β-defect content in DArP poly(3-hexylthiophene) (P3HT) on the performance of bulk-heterojunction solar cells and the morphology of pristine polymers and their blends with PC61BM in thin films and compare with Stille P3HT containing 0% β-defects as a reference point. The optical and electrochemical properties as well as the hole mobilities of pristine polymers remain virtually the same when the amount of β-defects is limited to 0.75% or lower, as evidenced by UV-visible absorption spectra, cyclic voltammetry and space-charge-limited current (SCLC) mobility measurements. However, an increase of β-defect concentration to 1.41% significantly affects the oxidation onset, UV-visible absorption profile and hole mobility of P3HT. The key result of this study is that the photovoltaic performance of DArP P3HT with 0% β-defects is remarkably close to that of Stille P3HT, whereas the performance of DArP P3HT with 0-0.75% β-defects does not dif...Continue Reading

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Citations

Nov 5, 2016·Chemical Reviews·Jean-Rémi PouliotMario Leclerc
Jan 27, 2017·Journal of the American Chemical Society·François GrenierMario Leclerc
Sep 11, 2018·Macromolecular Rapid Communications·J Terence Blaskovits, Mario Leclerc
Jan 30, 2014·Nanotechnology·Anna Demming
Dec 10, 2016·Journal of the American Chemical Society·Alexander S DudnikTobin J Marks

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