 |
Fig.1 Molecular structure and device performance of a novel two-dimensional conjugated polymer PBDT-TS1
Figure 2 Molecular design of two-dimensional conjugated polymers
The benzodithiophene polymer with two-dimensional conjugated structure is a kind of high-performance polymer photovoltaic material developed by the researchers of the Institute of Chemistry, Chinese Academy of Sciences. Such materials have outstanding advantages such as wide absorption and high mobility. Become a research hotspot in the field of polymer solar cells.
In the past three years, researchers at the Key Laboratory of Polymer Physics and Chemistry at the Institute of Chemistry have systematically studied two-dimensional conjugated polymer photovoltaic materials and their applications in polymer solar cells. In previous studies, they found that the conversion of alkoxy groups on the side chains of benzodithiophene polymers to conjugated thiophene alkyl groups has been effectively improved in energy conversion efficiency (Angew.Chem.Int.Ed. 2011, 50,9697-9702; Macromolecules 2012,45,3032-3038; Macromolecules 2012,45,9611-9617). On this basis, they conducted in-depth studies on their molecular structures, aggregated state structures, and photovoltaic properties and found extended conjugation (Adv. Mater. 2012, 24, 3383-3389; Adv. Mater. 2013, 25, 3449-3455. J.Phys.Chem.C 2013,117,9550-9557) can effectively modulate the aggregated state structure, introducing electron-withdrawing groups (2014, 26, 1118-1123; Adv. Mater. 2014, 26, 2089-2095) can be Effectively regulate molecular energy levels.
Recently, under the strong support of the Chinese Academy of Sciences, the National Natural Science Foundation of China, the Beijing Municipal Committee of Science, and the Institute of Chemistry, the researchers of this research group have also introduced linear alkylthio-substituted thiophene as a functional group into benzene based on the above work. In dithiophene polymers, a novel two-dimensional conjugated polymer PBDT-TS1 was designed and synthesized (see Figure 1a).
Under the optimal conditions, the energy conversion efficiency of the solar cell based on the PBDT-TS1:PC71BM positive structure polymer is as high as 9.48%, which is the highest reported value of the polymer photovoltaic device with the same structure at present.
Atomic force microscopy, transmission electron microscopy, and X-ray diffraction tests have shown that PBDT-TS1 can form interpenetrating networks with 10–20 nm dimensions and good pi-pi stacking, resulting in higher energy conversion efficiency.
The results of the study were published in the Journal of Chemical Materials of the American Chemical Society (Chem.Mater.2014, 26, 3603-3605), which aroused widespread interest among peers and became the top ten for downloading the journal for the month of publication. In addition, they introduce selenophene groups as conjugated side chains into benzodithiophene polymers, and the designed and synthesized two-dimensional conjugated polymers PBDTTT-EFS (see Figure 1b) can also achieve up to 8.78% energy conversion. Efficiency (Macromolecules, 2014, 47, 4653-4659).
Based on the series of research results of high-efficiency two-dimensional conjugated polymer photovoltaic materials, they were invited to publish a review paper (Acc.Chem.Res., 2014, 47, 1595-1603) in the Journal of the Chemical Review of the American Chemical Society. Molecular design strategies for two-dimensional conjugated polymer photovoltaic materials (Figure 2).
Perfect Replacement for Old Exterior Light Fixtures: The upper and lower lighting design combined with the ultra-deep reflector cups are completely glare-free and will not disturb your neighbors. Using it in front of the garage door will not hurt the eyes when driving in, safer to use. 100-277V Input Voltage Up Down Lights: Commercial level outdoor lights, can perfectly show their advantages in your home and bring convenience to life. The surface of our up and down porch light outdoor is treated with a fine coating, which is not easy to corrode, rust and fade, and has excellent oxidation resistance and temperature resistance. The outdoor lights support high waterproof rating and can withstand the challenges of harsh weather such as rain, snow and wind when used outdoors. Jiangmen Synno Co., Ltd is a high and new-tech enterprise. Our company specialized in LED green light source. And we are engaged in medium and high-end LED decorative lighting with a whole set of design and manufacture of lamps and lanterns, development of control system and engineering supporting service. Our company is devoted to provide customers with LED application products. Synno has got through ISO9001 quality system certification of SGS of Switzerland, CE certification of European Union, GS certification, ROHS certification and relevant domestic LED lamps and lanterns certification.
Led Wall Light,Outdoor Wall Lamp,Wall Lamps,Outdoor Up Down Wall Lights,Garden Wall Light
Jiangmen Synno Lighting Co., Ltd. , https://www.synnoled.com