| 초록 |
Polymer solar cells consisting of fullerene bis-adduct and P3HT blends have shown higher efficiencies than P3HT:PCBM devices. In contrast, the use of fullerene bis-adducts in DA copolymer systems typically causes a decrease in the device’s performance. However, the reason for such poor performance in DA copolymer:fullerene bis-adduct blends is not fully understood. In this work, BHJ-type PSCs composed of three different electron donors with four different electron acceptors were chosen and compared. The three electron donors were (1) PBDTTPD, (2) PBDTTT-C, and (3) P3HT polymers. The four electron acceptors were (1) PCBM, (2) ICMA, (3) ICBA, and (4) ICTA. To understand the difference in the performance of BHJ-type PSCs for the three different polymers in terms of the choice of fullerene acceptor, the structural, optical, and electrical properties of the blends were measured by the EQE, photoluminescence, grazing incidence X-ray scattering, and transient absorption spectroscopy. |
