| 초록 |
The generally adapted strategy in designing low-band gap conjugated polymers is to alternate the electron-rich and electron-deficient units on the polymer backbone. Several low-band gap polymers have been utilized for organic photovoltaics (OPVs) with power conversion efficiency over 5%. In order to increase the efficiency of OPV devices, many aspects should be taken into account, such as the absorption coefficients of the materials, the exciton dissociation rates, and the charge-carrier mobilities. A series of new benzotriazole-containing low band gap polymers were synthesized by replacing conjugated electron-donating units, carbazole (PBTZ-C), fluorene (PBTZ-F), and benzodithiophene (PBTZ-B). The results indicate that their bandgaps as well as their molecular energy levels are readily tuned by copolymerizing with different electron-donating units. |
