Synthesis and Characterization of Benzotriazole-Diketopyrrolopyrrole-based Polymers
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We have developed benzotriazole (BTZ)-based conjugated polymers for photovoltaic applications. Side-chain engineering has been introduced to the conjugated backbones in order to provide processibility as well as and to tune layer interfaces. BTZ-based polymers showed the medium Eg of 2.04 eV with the highest occupied molecular orbital (HOMO) of -5.54 eV and the lowest unoccupied molecular orbital (LUMO) of -3.50 eV. After optimizing device processing conditions, we could achieve a highest PCE of 5.05% with Voc of 0.89 V, Jsc of 9.95 mA·cm-2, and FF of 57% in the inverted solar cells with a ZnO interlayer. We believe that this is attributed to better absorption in the visible region and superior film morphologies.