Zhang, Fangdi; Yu, Xiankang; Xiong, Minghai; Yin, Zhihong; Wang, Yang; Yu, Junting; Cao, Jiamin; Tan, Hua; Zhang, Maojie published an article in 2021. The article was titled ãDesigning efficient A-D-A1-D-A-type non-fullerene acceptors with enhanced fill factor via noncovalently conformational lockingã? and you may find the article in Synthetic Metals.Application of 624-28-2 The information in the text is summarized as follows:
Achieving high fill factor (FF) is a great challenge for non-fullerene organic solar cells (NF-OSCs) since the FF can be influenced by many factors. Herein, two A-D-A1-D-A-type non-fullerene acceptors (NFAs) PZ-dIDTC6 and PD-dIDTC6, consisting of indacenodithiophene (IDT) dimers bridged with weak electron withdrawing pyrazine (PZ) or pyridine (PD) unit, were designed and synthesized. Relative to the PD-dIDTC6, PZ-bridged PZ-dIDTC6 showed a wider absorption range in the 500-800 nm with lower optical band gap of 1.57 eV (â?0 nm red-shifted than PD-dIDTC6), due to the more planar conformation caused by noncovalently conformational locking. Furthermore, the PM6:PZ-dIDTC6 film shown higher and balanced mobility (1.33 x 10-4 cm2 V-1 s-1 for hole and 1.88 x 10-4 cm2 V-1 s-1 for electron), which contributed to the high FF of devices. OSCs based on PM6:PZ-dIDTC6 exhibited a power conversion efficiency (PCE) of 10.91% with a FF of 0.75, while the PM6:PD-dIDTC6 device yielded a PCE of 7.78% with a FF of 0.56. This work demonstrates that noncovalently conformational locking is propitious to improve the FF of devices. In addition to this study using 2,5-Dibromopyridine, there are many other studies that have used 2,5-Dibromopyridine(cas: 624-28-2Application of 624-28-2) was used in this study.
2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Application of 624-28-2