Citation: Liu Zuoji, Bao Chengjia, Zhang Guangjun, Zhang Kai, Lei Gangtie, Zhang Qiang, Peng Qiang, Liu Yu. Enhancement the photovoltaic performance of conjugated polymer based on simple head-to-head alkylthio side chains engineered bithiophene[J]. Chinese Chemical Letters, ;2020, 31(9): 2459-2464. doi: 10.1016/j.cclet.2020.02.021 shu

Enhancement the photovoltaic performance of conjugated polymer based on simple head-to-head alkylthio side chains engineered bithiophene

Liu Zuoji ^b,1 ,
Bao Chengjia ^a,1 ,
Zhang Guangjun ^c ,
Zhang Kai ^a ,
Lei Gangtie ^b,**, ,
Zhang Qiang ^a ,
Peng Qiang ^c,**, ,
Liu Yu ^a,b,*,

a.
School of Materials Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Changzhou 213164, China
b.
College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in the Ministry of Education, Xiangtan University, Xiangtan 411105, China
c.
Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, and State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China

^**

lgt@xtu.edu.cn

liuyu03b@126.com

Received Date: 16 November 2019
Revised Date: 10 January 2020
Accepted Date: 19 January 2020
Available Online: 14 February 2020

Figures(10)

In this article, three novel and simple molecular structure with donor-acceptor (D-A) type copolymers via only head-to-head alkoxy (OR) and/or alkylthio (SR) side chains onto the bithiophene (BT) as donor units and fluorinated benzotriazole (FBTA) as acceptor unit, namely, PBTOR-FBTA, PBTOSR-FBTA and PBTSRFBTA, were successfully designed and synthesized. The impacts of sulfur-oxygen (S⋯O) or sulfur-sulfur (S⋯S) noncovalent interactions on their physicochemical properties, molecular stacking, carrier mobility, morphologies of blend films, as well as their photovoltaic performance were deeply and systematically studied. The introduction of SR side-chains suddenly lowered the highest occupied molecular orbital (HOMO) energy levels, blue-shifted absorption, enhanced π-π stacking, as well as improved morphology of the photoactive layer blends in comparison with the reference polymer without SR side-chain. Polymer solar cells (PSCs) were fabricated to estimate their photovoltaic performance of the polymers. Under an optimized blend ratio of PBTSR-FBTA:PC₇₁BM (1:0.8, w/w), the PBTSR-FBTAbased device exhibits a higher power conversion efficiency (PCE) of 6.25%, which is about 3.34 and 1.87 folds than that of the PBTOR-FBTA and PBTOSR-FBTA-based devices, respectively. Our research results demonstrate that the modification of the simple and low-cost SR side chains is an effective strategy to improve the photovoltaic performance of the polymers.
- Bithiophene,
- Fuorobenzotriazole,
- Alkoxy side chain,
- Alkylthio side chain,
- Polymer solar cells
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