Citation: YUAN Jun, LIU Ye, ZHU Can, SHEN Ping, WAN Meixiu, FENG Liuliu, ZOU Yingping. Asymmetric Quinoxaline-Based Polymer for High Efficiency Non-Fullerene Solar Cells[J]. Acta Physico-Chimica Sinica, ;2018, 34(11): 1272-1278. doi: 10.3866/PKU.WHXB201803221 shu

Asymmetric Quinoxaline-Based Polymer for High Efficiency Non-Fullerene Solar Cells

YUAN Jun ¹ ,
LIU Ye ¹ ,
ZHU Can ¹ ,
SHEN Ping ² ,
WAN Meixiu ³ ,
FENG Liuliu ¹ ,
ZOU Yingping ^1,,

1.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
2.
College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, P. R. China
3.
Institute of New Energy Technology, College of Information and Technology, Jinan University, Guangzhou 510632, P. R. China

Corresponding author: ZOU Yingping, yingpingzou@csu.edu.cn
Received Date: 22 February 2018
Revised Date: 19 March 2018
Accepted Date: 20 March 2018
Available Online: 22 November 2018
Fund Project: The project was supported by the National Natural Science Foundation of China (51673205, 51173206) and the Science Fund for Distinguished Young Scholars of Hunan Province, China (2017JJ1029)the Science Fund for Distinguished Young Scholars of Hunan Province, China 2017JJ1029the National Natural Science Foundation of China 51173206the National Natural Science Foundation of China 51673205

Polymer solar cells (PSCs) with bulk heterojunction (BHJ) structures have seen rapid development in recent years. In comparison with their inorganic counterparts, PSCs have some advantages such as low cost, light weight, solution processability, and good mechanical flexibility. However, improvement of the power conversion efficiency (PCE) of PSCs is required for commercial applications. In order to achieve high-performance PSCs, active layers, including donor polymers and acceptors, are very important. Several design principles for conjugated donor polymers in PSCs have emerged, including optimization of the conjugated backbone, side-chains, and substituents. In the past few decades, various classes of electron-donating polymers have been reported for PSCs. Among them, quinoxaline (Qx) is a unique building block for the construction of different optoelectronic polymers because of its planar, rigid, and conjugated structure. Qx derivatives have proven interesting and have been widely employed in many fields. Qx-based conjugated polymers (or small molecules) can be easily modified to match with ball-like fullerene derivatives such as PCBM ([6, 6]-phenyl-C₆₁ or C₇₁-butyric acid methyl ester) or weak crystalline non-fullerene acceptors such as 2, 2'-[[6, 6, 12, 12-tetrakis(4-hexylphenyl)-6, 12, -dihydrodithieno[2, 3-d:2', 3'-d']-s-indaceno[1, 2-b:5, 6-b']dithiophene-2, 8-diyl]bis[methylidyne(3-oxo-1H-indene-2, 1(3H)-diylidene)]]bispropanedinitrile (ITIC). Herein, we synthesized a Qx-based polymer with asymmetric side-chains (TPQ-1). The molecular weight, optical properties, molecular energy levels, and mobilities of TPQ-1 were investigated. Furthermore, the blend morphologies and photovoltaic properties of TPQ-1 using a strong crystalline non-fullerene (NF) acceptor (o-IDTBR) were systematically explored. The photovoltaic performance of TPQ-1 and its symmetric side-chain counterpart, HFQx-T, was compared. The introduction of asymmetric side-chains led to a favorable phase separation when blended with o-IDTBR. As expected, the TPQ-1:o-IDTBR-based devices exhibited a high PCE of 8.6% after thermal annealing (TA). In contrast, the HFQx-T:o-IDTBR-based devices showed a moderate PCE of 5.7%, moreover, the PCE was decreased to 4.6% after TA treatment. More importantly, a low bandgap material, PTB7-Th, was specifically selected as a third component to mix with the TPQ-1:o-IDTBR blend to form highly-efficient ternary PSCs. At an optimal weight ratio (15%) of PTB7-Th addition, a PCE of 9.6% was achieved. In the systems that were investigated, TPQ-1 demonstrated significantly better photovoltaic properties than the HFQx-T-based devices. These results indicate that Qx-based polymers with asymmetric side chains have a bright future in photovoltaic devices.
- Non-fullerene solar cells,
- Asymmetric side chain,
- Quinoxaline based polymer,
- Phase separation
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