Two new fluorinated copolymers based on thieno[2,3-f]benzofuran for efficient polymer solar cells

Dingjun He; Lixia Qiu; Zhiguo Zhang; Yongfang Li; Chunyue Pan; Yingping Zou

doi:10.1039/C6RA09791J

Two new fluorinated copolymers based on thieno[2,3-f]benzofuran for efficient polymer solar cells†

Dingjun He,^a Lixia Qiu,^a Zhiguo Zhang,^b Yongfang Li,^b Chunyue Pan^a and Yingping Zou*^a

* Corresponding authors

^a College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
E-mail: yingpingzou@csu.edu.cn

^b Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Abstract

Two new copolymers named TBFPF-BT and TBFPF-BO, composed of a fluorine substituted thieno[2,3-f]benzofuran donor unit and benzothiadiazole/benzooxadiazole acceptor unit, have been synthesized as the donor materials for polymer solar cell (PSC) applications. Both polymers presented wide absorptions (300–800 nm) in the UV-Vis region. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were −5.28/−3.60 eV and −5.38/−3.69 eV for TBFPF-BT and TBFPF-BO, respectively. PSCs with the blends of TBFPF-BT/TBFPF-BO and PC₇₁BM (1 : 2, w/w) as photoactive layers exhibited relatively low photovoltaic performances. After optimizing with 1% 1,8-diiodooctane (DIO) as additive, dramatic changes in short-circuit current density (J_sc) and fill factor (FF) were seen, with PCE up to 6.80% and 5.98% under AM 1.5, 100 mW cm⁻² for TBFPF-BT and TBFPF-BO, respectively. Compared to TBFPF-BO, the higher PCE mainly benefits from the higher hole mobility and better morphology for the TBFPF-BT and PC₇₁BM blend film.

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DOI: https://doi.org/10.1039/C6RA09791J
Article type: Paper
Submitted: 15 Apr 2016
Accepted: 19 Jun 2016
First published: 22 Jun 2016

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RSC Adv., 2016,6, 62923-62933

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Two new fluorinated copolymers based on thieno[2,3-f]benzofuran for efficient polymer solar cells

D. He, L. Qiu, Z. Zhang, Y. Li, C. Pan and Y. Zou, RSC Adv., 2016, 6, 62923 DOI: 10.1039/C6RA09791J

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Two new fluorinated copolymers based on thieno[2,3-f]benzofuran for efficient polymer solar cells†

Abstract

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Two new fluorinated copolymers based on thieno[2,3-f]benzofuran for efficient polymer solar cells

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