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Synthesis and photovoltaic properties of a star-shaped molecule with triphenylamine as core and benzo[1,2,5]thiadiazol vinylene as arms |
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| Authors: | Guanglong Wu Guangjin Zhao Chang He Qingguo He Yongfang Li |
| Affiliation: | a Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China b Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China c Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | A solution-processable and star-shaped molecule 4-((E)-2-(benzo1,2,5]thiadiazol-4-yl)vinyl)-N,N-bis(4-((E)-2-(benzo1,2,5]thiadiazol-7-yl)vinyl)phenyl)benzenamine (TPA-BT) has been designed and synthesized by palladium-catalyzed Heck reaction for the application in organic solar cells (OSCs). The molecule possesses a D-A structure with a triphenylamine core (donor unit) linked with three benzo1,2,5]thiadiazole (acceptor unit) arms through double bonds. TPA-BT film shows a strong absorption peak in the visible wavelength range from 400 to 560 nm, which could be ascribed to the charge transfer band of the D-A structure of the molecule. The bulk-heterojunction OSCs with the device structure of ITO/PEDOT:PSS/TPA-BT:PCBM/Ca/Al (or Ba/Al) were fabricated by spin-coating the blend solution of TPA-BT and PCBM (1:3, w/w), in which TPA-BT was used as donor and PCBM as acceptor materials. The devices show a high open circuit voltage of ca. 0.9 V and a power conversion efficiency of 0.61%, under the illumination of AM 1.5, 100 mW/cm2. The results indicate that TPA-BT is a promising solution-processable organic photovoltaic material. |
| Keywords: | Star-shaped molecules Organic photovoltaic materials Conjugated organic molecules Solution-processable Organic solar cells |
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