Surface Energy Modification of Semi-Random P3HTT-DPP

Jenna B Howard; Seyma Ekiz; Sangtaik Noh; Barry C Thompson

doi:10.1021/acsmacrolett.6b00436

Surface Energy Modification of Semi-Random P3HTT-DPP

ACS Macro Lett. 2016 Aug 16;5(8):977-981. doi: 10.1021/acsmacrolett.6b00436. Epub 2016 Aug 2.

Authors

Jenna B Howard¹, Seyma Ekiz¹, Sangtaik Noh¹, Barry C Thompson¹

Affiliation

¹ Department of Chemistry, Loker Hydrocarbon Research Institute, University of Southern California, Los Angeles, California 90089-1661, United States.

PMID: 35607215
DOI: 10.1021/acsmacrolett.6b00436

Abstract

Alkyl solubilizing side chains on conjugated polymers can serve as a handle for modifying polymer properties. Recently, oligo-ether and semifluoro alkyl side chains were utilized to tune the surface energy of random P3HT-based polymers without changing the optical and electronic properties. Here, this method is applied to semi-random poly(3-hexylthiophene-thiophene-diketopyrrolopyrrole) (P3HTT-DPP) and the subsequent polymer device, optical, electronic, structural, and thermal properties are characterized. P3HTMETT-DPP, bearing oligo-ether side chains, exhibited higher crystallinity, closer lamellar packing, and lower temperature thermal transitions. P3HTFHTT-DPP, featuring semifluoro alkyl side chains, presented reduced crystallinity, greater lamellar packing distances, and higher temperature thermal transitions. P3HTMETT-DPP performed similarly to P3HTT-DPP under identical processing conditions, whereas P3HTFHTT-DPP had greatly reduced J_SC due to lower polymer concentration necessitated by solubility.