Citation: Jing Ren, Wei-ye Chen, Feng Li, Wei Wang, Ren-qiang Yang, Ming-liang Sun. Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers[J]. Acta Polymerica Sinica, ;2018, (4): 456-463. doi: 10.11777/j.issn1000-3304.2017.17124 shu

Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers

Jing Ren ¹ ,
Wei-ye Chen ^1,2 ,
Feng Li ³ ,
Wei Wang ¹ ,
Ren-qiang Yang ² ,
Ming-liang Sun ^1,,

1.
School of Materials Science and Engineering, Ocean University of China, Qingdao 266100
2.
Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy Sciences, Qingdao 266101
3.
School of Polymer Science and Engineering, Qingdao University of Science & Technology, Qingdao 266042

Corresponding author: Ming-liang Sun, mlsun@ouc.edu.cn
Received Date: 7 May 2017

In the polymer solar cells research field, dithieno[3, 2-b:2', 3'-d]pyrrole (DTP) is a good donor unit due to its good planarity when it is used as build donor-acceptor (D-A) polymer. In this work, three DTP based polymers (named P1, P2, P3) are synthesized by polymerizing DTP with DPP, DTBO and TQ co-monomer acceptor unit, respectively. These three polymers exhibit good solubility in common solvent such as dichlorobenzene. GPC results show that the polymers show moderate number-average molecular weights (M_n, 9×10³ to 2.2×10⁴) and narrow PDI (1-2). UV-Vis absorption spectra in solution and thin film show that the polymers have a relatively narrow band gap (P1:1.23 eV; P2:1.51 eV; P3:1.50 eV), which enhances the polymer absorption of sunlight, with P1 showing the widest absorption (extending UV-Vis absorption to nearly 1000 nm). The thermal property of these polymers is measured by thermogravimetric analysis (TGA), giving their T_d located at 313-410℃. The highest occupied molecular orbital (HOMO) energy levels of the polymers are between -5.2 eV and -5.4 eV, as tested by CV method. Photovoltaic devices are fabricated with P1-P3 as donor and PC₇₁BM as acceptor in active layer. The solar cells J-V test results reveal that P1 has the highest PCE of 3.33% with J_SC of 15.82 mA/cm², V_OC of 0.38 V when the mass ratio of P1 to PC₇₁BM is kept at 1:3. The relative high PCE of P1 based PSCs devices is due to the wide light absorption, leading to high J_SC of PSCs devices, which also can be confirmed by external quatum efficiency (EQE) test. For the polymers P2 and P3, with the mass ratio of polymer/PC₇₁BM at 1:2, PCE of 1.20% for P2 and 1.37% of P3 are achieved respectively, and the relatively low PCE is caused by low short circuit current density (J_SC) (P2:9.70 mA/cm², P3:9.21 mA/cm²) and the low open-circuit voltage (V_OC, only around 0.3 V). Transmission electron microscopy is also used to explore the polymer solar cells active layer morphology, which correlates closely with the donor and the acceptor aggregations and the phase separation.
- Dithieno[3, 2-b:2', 3'-d]pyrrole,
- Conjugated polymer,
- Photovoltaic material,
- Polymer solar cells
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com