| 초록 |
Two novel polymeric semiconductor materials based on dithieno[3,2-b:2’,3’-d]phosphole, PDDTP-BDTTR and PDDTP-BDTSeR, were designed and synthesized for use in polymer solar cells. PDDTP-BDTTR contained thiophene substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) units, and PDDTP-BDTSeR contained selenophene substituted BDT units. The photophysical and electrochemical measurement demonstrated that these two conjugated polymers had small optical band gaps (＜1.6 eV), broad absorption, in the wavelength range of 300−800 nm, and low highest occupied molecular orbital (HOMO) energy levels (−5.60 eV). The new polymer semiconductors exhibited very promising optoelectronic performance. The field-effect mobilities of the holes varied from 6 × 10−4 cm2 V−1 s−1 in PDDTP-BDTTR to 3 × 10−3 cm2 V−1 s−1 in PDDTP-BDTSeR. Under optimized conditions, the dithiophenephosphole-based polymers showed power conversion efficiencies (PCEs) for the PSCs in the range of 4.04–5.06%. |
