Syntheses of Polymers including DTBT as Electron Withdrawing Unit and TI as Electron Donating Unit for Organic Solar Cells
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Organic solar cells (OSCs) are regarded as one of the efficient solar technologies for environmental energy application due to the advantages such as light weight, low cost large areas roll-to-roll production.[1] Herein, we designed and synthesized the conjugated polymers including 4,7-di-2-thienyl-2,1,3-benzothiadiazole (DTBT) unit as electron withdrawing group and thieno[2,3-b]indole (TI) unit as electron donating group. In this study, F atoms were introduced into the DTBT backbone to add the electron-deficient properties. And we synthesized PTIDTBT, PTIFDTBT and PTIDFDTBT including DTBT unit with different number of F atoms. The conjugated polymers with the electron withdrawing group and the electron donating group are synthesized by Suzuki Coupling with Pd catalyst. The device using PTIDFDTBT showed a VOC of 0.79 V, a JSC of 8.39 mA/cm2, and a FF of 0.48, giving a highest PCE of 3.21%. [1] Su, Y.-W; Lan, S.-C.; Wei, K.-H. Organic photovoltaics. Mater. Today, 2012, 15, 554-562.