| 초록 |
Polymer solar cells (PSCs) have drawn attention due to the interesting advantages of ease of fabrication, light weight, low cost, large-areas roll-to-roll process, and continuously improving power conversion efficiencies into flexible devices. Here, we synthesized 4,7-di-2-thienyl-2,1,3-Benzothiadiazole (DTBT) based polymers as donor group. In this paper, F atoms were introduced into the DTBT back bone to manipulate the electron-deficient properties. The F atom is well known as small size and only somewhat larger than hydrogen. Furthermore, Fluorine atom has the highest electronegativity of others. We synthesized HS-5619, HS-5588 and HS-5589 containing DTBT as donor unit with different numbers of F atoms on the backbone. The device including HS-5589 showed a VOC of 0.79 V, a JSC of 8.39 mA/cm2, and a FF of 0.48, giving a PCE of 3.21%. |
