| Autor: |
Privado M; Institute of Nanoscience, Nanotechnology and Molecular Materials, Universidad de Castilla-La Mancha , Campus de la Fábrica de Armas, 45071 Toledo, Spain., Cuesta V; Institute of Nanoscience, Nanotechnology and Molecular Materials, Universidad de Castilla-La Mancha , Campus de la Fábrica de Armas, 45071 Toledo, Spain., de la Cruz P; Institute of Nanoscience, Nanotechnology and Molecular Materials, Universidad de Castilla-La Mancha , Campus de la Fábrica de Armas, 45071 Toledo, Spain., Keshtov ML; A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences , 28 Vavilova Street, Moscow 119991, Russia., Singhal R; Department of Physics, Malaviya National Institute of Technology , Jaipur 302017, Rajasthan, India., Sharmad GD; Department of Physics, Malaviya National Institute of Technology , Jaipur 302017, Rajasthan, India.; Department of Physics, LNM Institute of Information Technology , Rupa ki Nagal, Jamdoli, Jaipur 302031, Rajasthan, India., Langa F; Institute of Nanoscience, Nanotechnology and Molecular Materials, Universidad de Castilla-La Mancha , Campus de la Fábrica de Armas, 45071 Toledo, Spain. |
| Abstrakt: |
Herein we report the synthesis of a novel A-D-A-D-A non-fullerene small-molecule acceptor (NFSMA) bearing a diketopyrrolopyrrole (DPP) acceptor central core coupled to terminal rhodanine acceptors via a thiophene donor linker (denoted as MPU1) for use in non-fullerene polymer solar cells (PSCs). This NFSMA exhibits a narrow optical band gap (1.48 eV), strong absorption in the 600-800 nm wavelength region of the solar spectrum, and a lowest unoccupied energy level of -3.99 eV. When the mixture of a medium band gap D-A copolymer P (1.75 eV) was used as donor and MPU1 as acceptor, the blend film showed a broad absorption profile from 400 to 850 nm, beneficial for light harvesting efficiency of the resulted polymer solar cell. After optimization of the donor-to-acceptor weight ratios and concentration of solvent additive, the P-MPU1-based PSC exhibited a power conversion efficiency of 7.52% (J sc = 12.37 mA/cm 2 , V oc = 0.98 V, and fill factor = 0.62), which is much higher than that for a P3HT-MPU1-based device (2.16%) prepared under identical conditions. The higher value for the P-MPU1-based device relative to the P3HT-MPU1-based one is related to the low energy loss and more balanced charge transport in the device based on the P donor. These results indicate that alteration of the absorption spectra and electrochemical energy levels of non-fullerene acceptors, and appropriate selection of the polymer donor with complementary absorption profile, is a promising means to further boost the performance of PSCs. |
