Tuning Surface Energy of Conjugated Polymers via Fluorine Substitution of Side Alkyl Chains: Influence on Phase Separation of Thin Films and Performance of Polymer Solar Cells | Zendy

Yanfeng Liu | Zendy; Dandan Tang | Zendy; Kaicheng Zhang | Zendy; Peng Huang | Zendy; Zhaowei Wang | Zendy; Kai Zhu | Zendy; Zhendong Li | Zendy; Ligang Yuan | Zendy; Jian Fan | Zendy; Yi Zhou | Zendy; Bo Song | Zendy

Open Access

Tuning Surface Energy of Conjugated Polymers via Fluorine Substitution of Side Alkyl Chains: Influence on Phase Separation of Thin Films and Performance of Polymer Solar Cells

Author(s) -

Yanfeng Liu,

Dandan Tang,

Kaicheng Zhang,

Peng Huang,

Zhaowei Wang,

Kai Zhu,

Zhendong Li,

Ligang Yuan,

Jian Fan,

Yi Zhou,

Bo Song

Publication year - 2017

Publication title -

acs omega

Language(s) - English

Resource type - Journals

ISSN - 2470-1343

DOI - 10.1021/acsomega.7b00468

Subject(s) - side chain , alkyl , polymer , materials science , conjugated system , fluorine , phase (matter) , surface energy , polymer solar cell , chemical engineering , photovoltaic system , phase transition , polymer chemistry , organic chemistry , chemistry , composite material , thermodynamics , physics , ecology , engineering , metallurgy , biology

Different contents of fluorine in side alkyl chains were incorporated into three conjugated polymers (namely, PBDTTT-f13, PBDTTT-f9, and PBDTTT-f5) whose backbones consist of benzodithiophene donors and thienothiophene acceptors. These three fluorinated polymers, in comparison with the well-known analogue PTB7-Th, show comparable energy levels and optical band gaps. However, the fluorination of side alkyl chains significantly changed the surface energy of bulk materials, which leads to distinctly different self-assembly behaviors and phase separations as being mixed with PC 71 BM. The increased mismatch in surface energies between the polymer and PC 71 BM causes larger scale phase domains, which makes a sound explanation for the difference in their photovoltaic properties.

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