Portal de Periódicos da CAPES

Synthesis of a conjugated copolymer with benzodithiophene and benzimidazole units

2012; Springer Nature; Volume: 45; Issue: 5 Linguagem: Inglês

10.1038/pj.2012.168

1349-0540

Suhee Song, Seo‐Jin Ko, Ju Ae Kim, Youngeup Jin, Il Kim, Jin Young Kim, Hongsuk Suh,

Perovskite Materials and Applications

A new accepter unit, dimethyl-2H-benzimidazole, was prepared and utilized for the synthesis of conjugated polymers containing an electron donor–acceptor pair for organic photovoltaics (OPVs). A dimethyl-2H-benzimidazole unit was designed to replace the benzothiadiazole (BT) unit of PCDTBT. An advantage of dimethyl-2H-benzimidazole compared with the BT moiety of PCDTBT is that the solubility of the polymer is improved while the 1,2-quinoid form is maintained to lead the coplanarity of the backbone. New semiconducting copolymers with dialkoxybenzo[1,2-b:3,4-b′]dithiophene as the electron-rich unit and 2,2-dimethyl-4,7-di(2-thienyl)-2H-benzimidazole as the electron-deficient unit were synthesized by Pd(0)-catalyzed Stille coupling polymerization. The resulting P2:PC71BM device had a open circuit voltage (VOC) value of 0.65 V, a short circuit current density (JSC) value of 1.86 mA cm−2 and a FF value of 0.39, with a final power conversion efficiency (PCE) value of 0.47%. A new accepter unit, dimethyl-2H-benzimidazole, was prepared and utilized for the synthesis of the conjugated polymers containing electron donor–acceptor pair for organic photovoltaics. Dimethyl-2H-benzimidazole unit was designed to substitute the benzothiadiazole (BT) unit of PCDTBT. The advantage of dimethyl-2H-benzimidazole compared with the BT moiety of PCDTBT is to improve the solubility of the polymer while keeping the 1,2-quinoid form to lead coplanarity of the backbone.