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Dimethyl-2H-benzimidazole based small molecules as donor materials for organic photovoltaics |
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| Authors: | Suhee SongHyojung Han Yonghee KimByoung Hoon Lee Sung Heum Park Youngeup JinIl Kim Kwanghee Lee Hongsuk Suh |
| Affiliation: | a Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea b Graduate Program of Photonics and Applied Physics, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea c Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea d Department of Industrial Chemistry, Pukyong National University, Busan 608-739, Republic of Korea e The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Republic of Korea f Department of Physics, Pukyong National University, Busan 608-739, Republic of Korea |
| Abstract: | Utilization of 2,2-dimethyl-2H-benzimidazole has received strong attention as the electron-deficient unit for the generation of electron donor material for organic photovoltaic cells (OPVs). This paper reports the first small organic molecules based on dimethyl-2H-benzimidazole, which can produce intramolecular charge transfer. Two soluble small organic molecules, MMM and OMO, with dimethyl-2H-benzimidazole unit were synthesized by Suzuki coupling reaction with Pd(0)-catalyst. The spectra of MMM and OMO in the solid thin films show absorption bands with maximum peaks at 374, 598 and 373, 588 nm, and the absorption onsets at 678 and 673 nm, corresponding to band gaps of 1.83 and 1.84 eV, respectively. The devices comprising MMM with PC61BM (1:3) showed a VOC of 0.66 V, a JSC of 2.03 mA/cm2, and a fill factor (FF) of 0.27, giving a power-conversion efficiency of 0.37%. |
| Keywords: | Small molecular Photovoltaic cells 2H-benzimidazole |
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