Polymer acceptor materials have good mechanical properties and stability in morphology. All-polymer solar cells have good application prospects in portable charging, photovoltaic integrated buildings and new wearable electronic devices.
In recent years, breakthroughs have been made in organic photovoltaic devices based on all-polymer-to-receptor materials. Polymeric electron acceptor materials can well compensate for the low absorption coefficients of the conventional fullerene acceptor materials in the visible and near-infrared regions. Difficult chemical modification, poor thermal stability in the phase zone, etc. At the same time the polymer acceptor material has good mechanical properties and morphology stability. All-polymer solar cells in portable charging, photovoltaic integrated architecture and new wearable electronic devices, etc. It has good application prospects. However, its photoelectric conversion efficiency still cannot meet the requirements of industrial applications. It is also necessary to develop polymer materials with narrow band gap, high mobility and high stability, optimize the device structure and conduct in-depth system research.
Achievements
Recently, Professor Ma Wanli of the Institute of Functional Nano and Soft Materials of Soochow University published a paper titled Improved Tandem All-Polymer Solar Cells Performance by Using Spectraally Matched Sub-Cells on Advanced Energy Materials. The paper uses triplets. The idea of designing a conjugated polymer backbone with an isotactic type, and introducing a molecular modification strategy for hydrogen (H)-fluorine (F) atom substitution, reported a novel ternary component with high efficiency in the near-infrared region response. Polymer donor material PBFSF. The high regularity of the molecular backbone structure ensures the high carrier mobility of the material, and the substitution of HF atoms can effectively enhance the interaction between molecules and enhance the crystallinity of the material. The conjugated polymer N2200 acts as an electron acceptor to produce an all-polymer non-fullerene cell device with a single-cell photoelectric conversion efficiency of 6%. By characterizing the external quantum efficiency of the device and the absorption of the active layer, we find that The PBFSF/N2200 device has a strong light response at 600-800 nm, while the absorption and spectral response in the ultraviolet and visible light regions are very low. These results indicate that the PBF SF/N2200 is an ideal active layer material for stacked subcells of stacked devices. Combined with our previously reported high efficiency wide band gap all-polymer battery PTP8/P (NDI2HD-T), we have reported for the first time in the world. High-efficiency all-polymer battery devices achieve an optical conversion efficiency of 8.3%, which is also the highest efficiency reported in the literature on stacked all-polymer batteries. At present, the thickness of the active polymer layer of all-polymer batteries is only about 80 nm, although carriers can be reduced. The compounding in the transmission process, however, reduces the utilization efficiency of the active layer to the sunlight. Our results show that the construction of an absorption spectrum matched laminated cell can effectively improve the photoelectric conversion efficiency of the all-polymer solar cell.
