All-polymer non-fulilene tandem solar cell

Organic photovoltaic devices based on all-polymer to acceptor materials have made breakthroughs in recent years. The polymer electron acceptor material can well compensate for the low absorption coefficient of the traditional fullerene acceptor material in the visible and near-infrared regions, the difficulty in chemical structure modification, and the poor thermal stability in the phase region. At the same time, the polymer acceptor material has good mechanical properties and morphological stability. All-polymer solar cells have good application prospects in portable charging, photovoltaic integrated buildings and new wearable electronic devices. 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 device structure and conduct in-depth systematic research.

Summary of results

Recently, Prof. Ma Wanli from the Institute of Functional Nano and Soft Materials of Soochow University published a paper entitled "Improved Tandem All-Polymer Solar Cells Performance by Using Spectrally Matched Sub-Cells" on Advanced Energy Materials. In this paper, the design idea of ​​ternary component-regulated conjugated polymer backbone was adopted, and a molecular modification strategy of hydrogen (H)-fluorine (F) atom substitution was introduced. A novel ternary component was reported. High-efficiency polymer donor material PBFSF in the near-infrared region. The highly regular molecular backbone structure ensures 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. A full-polymer non-fullerene battery device with a single-cell photoelectric conversion efficiency of 6% was prepared using the classical N-type conjugated polymer N2200 as an electron acceptor. By characterizing the external quantum efficiency of the device and the absorption of the active layer, we found that the PBFSF/N2200-based device has a strong photoresponse at 600-800 nm, while the absorption and spectral response in the ultraviolet and visible regions are low. These results indicate that PBFSF/N2200 is an ideal active layer material for post-substrate cells of stacked devices. Combined with our high-efficiency wide-bandgap all-polymer battery PTP8/P (NDI2HD-T), we have reported the first high-efficiency all-polymer battery device in the world, achieving a photoelectric conversion efficiency of 8.3%, which is also a laminated total polymerization. The highest efficiency reported in the literature. At present, the active layer thickness of the all-polymer battery is only about 80 nm. Although it can reduce the recombination of carriers during the transmission process, it reduces the utilization efficiency of the active layer to sunlight. Our results show that the absorption spectrum matching stack is constructed. The battery can effectively improve the photoelectric conversion efficiency of the all-polymer solar cell.

Graphic guide

Fig.1 Synthetic route of ternary component structured structured conjugated polymer

Fig. 2 Simulation of the main chain molecular skeleton of the novel polymer, variable temperature UV-visible absorption spectrum and GIWAXS test chart of the film

Figure 3 Single-section all-polymer solar cell current-voltage curve and device external quantum efficiency curve

Figure 4 laminated all-polymer solar cell

(a) laminated all-polymer solar cell device structure

(b) Comparison of absorption spectrum and solar radiation spectrum of active layer polymer materials

(c) Current-voltage curves for single-section and laminated all-polymer solar cells

(d) External quantum efficiency curve of laminated all-polymer solar cells

Figure 5 shows the efficiency distribution of battery devices based on N2200 as an electron acceptor.

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