Impact of Polymer Side Chain Modification on OPV Morphology and Performance | Zendy

Victoria Savikhin | Zendy; Maxime Babics | Zendy; Marios Neophytou | Zendy; Shengjian Liu | Zendy; Stefan D. Oosterhout | Zendy; Hongping Yan | Zendy; Xiaodan Gu | Zendy; Pierre M. Beaujuge | Zendy; Michael F. Toney | Zendy

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Impact of Polymer Side Chain Modification on OPV Morphology and Performance

Author(s) -

Victoria Savikhin,

Maxime Babics,

Marios Neophytou,

Shengjian Liu,

Stefan D. Oosterhout,

Hongping Yan,

Xiaodan Gu,

Pierre M. Beaujuge,

Michael F. Toney

Publication year - 2018

Publication title -

chemistry of materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.741

H-Index - 375

eISSN - 1520-5002

pISSN - 0897-4756

DOI - 10.1021/acs.chemmater.8b03455

Subject(s) - side chain , polymer , crystallinity , materials science , chemical engineering , crystallization , fullerene , crystallite , polymer solar cell , active layer , crystallization of polymers , polymer chemistry , nanotechnology , chemistry , crystallography , organic chemistry , layer (electronics) , composite material , engineering , thin film transistor

Efficiencies of organic photovoltaic (OPV) devices have been steadily climbing, but there is still a prominent gap in understanding the relationship between fabrication and performance. Side chain substitution is one processing parameter that can change OPV device efficiency considerably, primarily because of variations in morphology. In this work, we explain the morphological link between side chain selection and device performance in one polymer to aid in the development of design rules more broadly. We study the morphology of an OPV active layer using a PBDTTPD-backbone polymer with four different side chain configurations, which are shown to change device efficiency by up to 4 times. The optimal device has the smallest domain sizes, the highest degree of crystallinity, and the most face-on character. This is achieved with two branched 2-ethylhexyl (2EH) side chains placed symmetrically on the BDT unit and a linear octyl (C8) side chain on the TPD unit. Substituting either side chain (C14 on BDT and/or...

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