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In recent years, organic conjugated polymers have received extensive attention due to their excellent semiconductor properties. It has been found that the side chains of the polymers can not only increase the solubility of the polymers in organic solvents but also affect the semiconducting properties of the polymers.
Under the auspices of the Chinese Academy of Science's Strategic Pilot Science and Technology Project, researchers of the Zhang Deqing Research Group, a key laboratory of the Institute of Organic Solids of the Chinese Academy of Sciences’ Institute of Chemistry, have made series of research progresses in the research of the side chain modifying the performance of polymer semiconductors. They introduced urea groups into the side chains of the polymers to give conjugated polymers containing functional groups in the side chains, as shown in FIG. 1 . Due to the hydrogen bonding interactions between the side chains, the orderliness of the polymer films increases; compared with polymers without urea groups, the field-effect transistor mobility increases from 3.4 cm2V-1s-1 to 13.1 cm2V-1s. -1, The photoelectric conversion efficiency of the bulk heterojunction solar cell also increased from 3.8% to 6.8%. This study provides new insights into the study of polymer side chains and was recently published in the American Chemical Society (J. Am. Chem. Soc. 2016, 138, 173).
Further study found that the introduction of tetramethylammonium salt in the conjugated donor-acceptor polymer (DPPTTT) film resulted in a significant increase in the carrier mobility of the conjugated polymer film. The field effect transistor fabricated with this doped conjugated polymer film has a mobility of 26.2 cm2V-1s-1, and has a high switching ratio and strong air stability. The mechanism study shows that the presence of tetramethylammonium salt limits the side chain twisting, improves the film ordering, and enhances its semiconductor properties (Sci. Adv. 2016, 2, e1600076.). This result was reported by NanotechWeb as Ionic additive improves OFETs.
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