窄带隙二噻吩并吡咯共聚物合成与光伏性能研究

任静; 陈伟业; 李枫; 王玮; 阳仁强; 孙明亮

doi:10.11777/j.issn1000-3304.2017.17124

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窄带隙二噻吩并吡咯共聚物合成与光伏性能研究

研究论文 | 更新时间：2021-01-26

- 窄带隙二噻吩并吡咯共聚物合成与光伏性能研究
- Synthesis and Photovoltaic Performance of Low Band Gap Dithieno[3, 2-b:2', 3'-d]pyrrole-based Conjugated Copolymers
- 高分子学报 2018年第4期页码：456-463
- 作者机构：
  
  1.中国海洋大学材料科学与工程学院青岛 266100
  2.中国科学院青岛生物能源与过程研究所青岛 266101
  3.青岛科技大学高分子科学与工程学院青岛 266042
- 作者简介：
  
  孙明亮, E-mail: mlsun@ouc.edu.cn Ming-liang Sun, E-mail: mlsun@ouc.edu.cn
- 基金信息：
  
  国家自然科学基金(21274134)
- DOI：10.11777/j.issn1000-3304.2017.17124
  中图分类号：
- 纸质出版日期：2018-4-20，
  
  收稿日期：2017-5-7，
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任静, 陈伟业, 李枫, 王玮, 阳仁强, 孙明亮. 窄带隙二噻吩并吡咯共聚物合成与光伏性能研究[J]. 高分子学报, 2018,(4):456-463.

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.
任静, 陈伟业, 李枫, 王玮, 阳仁强, 孙明亮. 窄带隙二噻吩并吡咯共聚物合成与光伏性能研究[J]. 高分子学报, 2018,(4):456-463. DOI： 10.11777/j.issn1000-3304.2017.17124.

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.

摘要

二噻吩[3，2-b：2'，3'-d]并吡咯（Dithieno[3，2-b：2'，3'-d]

pyrrole，DTP）分别与3种受体单元聚合得到聚合物

，受体单元分别为：吡咯并吡咯二酮（DPP）、二噻吩苯并噁二唑（DTBO）和喹喔啉衍生物（TQ）.研究表明，3种聚合物都有较窄的带隙（

：1.23 eV，

：1.51 eV，

：1.50 eV），有利于活性层材料对太阳光的吸收，其中

获得了最宽的吸收（近1000 nm）.将

与PC

BM共混制备光伏器件，当给受体比例为1：3时，基于

的光伏器件短路电流密度（short-circuit current density，

）为15.82 mA/cm

，开路电压（open-circuit voltage，

）为0.38 V，能量转化效率（power conversion efficiency，PCE）达到3.33%，为3种聚合物中最高的效率.对于聚合物

和

，在给受体比例为1：2时，光伏性能最好，此时

与

的PCE值分别为1.20%和1.37%，导致较低光电转换效率的因素是短路电流密度

（

：9.70 mA/cm

，

：9.21 mA/cm

）和开路电压

（约0.3 V）过低.

Abstract

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

) 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 (

9×10

to 2.2×10

) and narrow PDI (1-2). UV-Vis absorption spectra in solution and thin film show that the polymers have a relatively narrow band gap (

:1.23 eV;

:1.51 eV;

:1.50 eV)

which enhances the polymer absorption of sunlight

with

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

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

as donor and PC

BM as acceptor in active layer. The solar cells

test results reveal that

has the highest PCE of 3.33% with

of 15.82 mA/cm

of 0.38 V when the mass ratio of

to PC

BM is kept at 1:3. The relative high PCE of

based PSCs devices is due to the wide light absorption

leading to high

of PSCs devices

which also can be confirmed by external quatum efficiency (EQE) test. For the polymers

and

with the mass ratio of polymer/PC

BM at 1:2

PCE of 1.20% for

and 1.37% of

are achieved respectively

and the relatively low PCE is caused by low short circuit current density (

) (

:9.70 mA/cm

:9.21 mA/cm

) and the low open-circuit voltage (

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.

关键词

二噻吩[3 2-b:2' 3'-d]并吡咯共轭聚合物光伏材料聚合物太阳能电池

Keywords

Dithieno[3 2-b:2' 3'-d]pyrroleConjugated polymerPhotovoltaic materialPolymer solar cells

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