D-A-A-D Type Polymer Donor, Phosphor-sensitized with Py_Pt-2 Complex, Enables Organic Solar Cells with High Efficiency and Stability
발표자
Priyanka Yadav (Pusan National University)
연구책임자
진성호 (부산대학교)
공동저자
Priyanka Yadav (Pusan National University), 마영빈 (부산대학교), 제갈영순 (경일대학교), Sung Ho Jin (부산대학교), 진성호 (부산대학교)
초록
내용
In this study, a new D-A-A-D polymer donor (DAAD-OMe) was synthesized. DAAD-OMe showed a film absorption peak at 559 nm and an optical band gap of 1.75 eV. The complementary absorption and energy offsets were observed between D18-Cl, DAAD-OMe, and the L8-BO acceptor. Furthermore, the ternary blend using DAAD-OMe was phosphor-sensitized with Py_Pt-2 dopant at 1 wt%, which enhances the PCEs of OSCs active layer processed via dual solvent. The ternary device obtains a PCE of 18.2% (Voc=0.91 V, Jsc=27.3 mA/cm², FF=75.5%), compared to 16.9% undoped, suggesting an improvement of 7.7%. Py_Pt-2 with λmax = 496 nm, HOMO/LUMO = -5.36/-2.72 eV, and energy alignment for triplet energy transfer and charge generation. Py_Pt-2 absorption complements the host blend, while the dopant suppresses non-radiative recombination, increasing Voc and FF. The results emphasize DAAD-OMe can be a powerful donor and PyPt-2 complex can be a potential phosphosensitizer for high-efficiency OSCs.