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High-rigidity quinoxalinyl-based co-sensitizer and co-sensitized solar cell

A quinoxaline-based, high-rigidity technology, applied in the field of dye-sensitized solar cells, can solve the problems that the efficiency of dye-sensitized solar cells needs to be improved, and achieve high efficiency, improved efficiency, and improved FF value

Pending Publication Date: 2022-07-05
HANGZHOU VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the current photoelectric conversion efficiency of perovskite solar cells or silicon-based solar cells that have been industrialized, the efficiency of dye-sensitized solar cells still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 Test of Optical Properties

[0029] This example tested the co-sensitizers LY01-LY03 and HD-2 in DMF (2×10 -5 M) UV-Vis absorption in solution, see figure 1 . figure 1 described the co-sensitizers LY01-LY03 and HD-2 in DMF (2 × 10 -5 M) UV-Vis absorption in solution. The maximum absorption peaks (λ) of LY01, LY02 and LY03 max ) can be observed at 490 nm, 496 nm and 494 nm, respectively. like figure 2 shown, the strong absorption region around 360–400 nm of the co-sensitizers LY01-LY03 can be attributed to the π→π* electron transition of the π-conjugated structure. The absorption region (400-600 nm) corresponds to intramolecular charge transfer (ICT) between the donor and acceptor. On the other hand, the molar extinction coefficient of this region is very low (0.87 × 104 cm for LY01 -1 M -1 , LY02 is 1.02×104cm -1 M -1 , LY03 is 1.08×104cm -1 ·M -1 ). Compared with LY01-LY03, HD-2 showed a higher molar extinction coefficient in the Soret band.

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Embodiment 2

[0031] Example 2 Test of Photovoltaic Performance

[0032] In this example, the photovoltaic performance of co-sensitized solar cells based on ruthenium-based dye HD-2 and quinoxaline-based dye LY01-LY03 was measured to evaluate the effect of co-sensitization on the photovoltaic performance of DSSCs. To improve photovoltaic performance and investigate the relationship between concentration and performance, DSSCs assembled with different concentrations of LY02 and HD-2 were investigated. The quinoxaline-based sensitizers LY01-LY03 included triphenylamine or 10-hexyl-10H-phenothiazine as a donor, a quinoxaline-based building block as a coreceptor, thiophene as a π bridge and cyanoacrylic acid as an anchor. Iodine solution (Solaronix, HI-30) was chosen as the electrolyte, and the lighting condition was set to AM 1.5. Furthermore, the co-adsorbent CDCA can effectively reduce Pt / electrolyte and FTO / TiO in DSSCs 2 Undesirable charge recombination that occurs at the / dye interface....

Embodiment 3

[0039] Figure 5 are J-V curves of devices sensitized with 0.2 mM or 0.3 mM HD-2 dye and 0.1, 0.2 or 0.3 mM sensitizer LY02, respectively. Table 2 shows the photoelectric parameters of the results. As shown in Table 2, co-sensitized DSSCs based on HD-2 and 0.2 mM LY02 exhibited better PCE (7.88%) than HD-2 alone (7.37%). Conversion efficiencies of 7.10, 7.88 and 6.34% were obtained with DSSCs co-sensitized with 0.2 mM HD-2 and 0.1, 0.2 and 0.3 mM LY02, respectively. Whereas DSSCs co-sensitized with 0.3 mM HD-2 and 0.1, 0.2 and 0.3 mM LY02 showed conversion efficiencies of 7.02, 6.56 and 6.55%, respectively. Although the devices co-sensitized with 0.2 mM LY02 and 0.2 mM HD-2 showed better results than the devices assembled with 0.2 mM HD-2 alone (19.39 mA cm -2 ) exhibited better photocurrent density (20.82 mA cm -2 ), but due to the severe competitive adsorption between LY02 and HD-2, HD-2 was adsorbed on TiO 2 The amount of adsorption on the surface was reduced, and all ...

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Abstract

The invention discloses a co-sensitizer based on a high-rigidity quinoxaline group. The co-sensitizer comprises a high-rigidity quinoxaline group dye and a ruthenium dye HD-2, the high-rigidity quinoxaline-based dye is a quinoxaline-based dye LY01, a quinoxaline-based dye LY02 and a quinoxaline-based dye LY03. Compared with single HD-2, a battery co-sensitized by the high-rigidity quinoxaline-based dye and the ruthenium dye HD-2 shows higher efficiency, the space between heavy HD-2 molecules can be filled by the adopted high-rigidity quinoxaline-based dye, the TiO2 surface is more effectively covered, and the FF value of the obtained battery is improved.

Description

technical field [0001] The invention belongs to the technical field of dye-sensitized solar cells, and in particular relates to a high-rigidity quinoxaline-based co-sensitizer and a co-sensitized solar cell. Background technique [0002] A solar cell is an optoelectronic semiconductor sheet that uses sunlight to generate electricity directly, also known as "solar chip" or "photocell". As long as it is illuminated by a certain illumination condition, it can output voltage instantly and in the case of a loop. generate current. In physics, it is called solar photovoltaic (Photovoltaic, abbreviated as PV), referred to as photovoltaic. A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. The crystalline silicon solar cells working with photovoltaic effect are the mainstream, while the implementation of solar cells with thin film cells working with photochemical effect is still in its infanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/042
CPCH01G9/2063
Inventor 吕路平童国通吴健金琳张永昭
Owner HANGZHOU VOCATIONAL & TECHN COLLEGE
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