Photoanode decoration material of dye sensitized solar cell

Abstract

The invention belongs to the field of dye-sensitized solar cell photoanode modification, and relates to a dye-sensitized solar cell photoanode modification material. The dye-sensitized solar cell photoanode modification material is a siloxane ionic liquid, and its structural formula is: wherein, R1 is an alkyl group of C1-C6, and R2 is an alkylene group of C1-C15, selected from: , or; the photoanode modification material is simple and easy to obtain, and the cost is low, and the dye prepared after using the material to modify the photoanode The sensitized solar cell has high stability and high cell efficiency. At room temperature, using a xenon lamp to simulate sunlight with a light intensity of 100mW / cm2, the measured photoelectric conversion efficiency of the cell is up to 6.39%.

Description

technical field [0001] The invention belongs to the field of dye-sensitized solar cell photoanode modification, and relates to a dye-sensitized solar cell photoanode modification material. Background technique [0002] The photoanode is the core component of dye-sensitized solar cells. Its main function is to use a huge surface area to adsorb monolayer dyes, and it is also a carrier for charge separation and transport. The semiconductor thin film materials used in dye-sensitized solar cells (DSSC) mainly include TiO 2 , ZnO, SnO 2 , Nb 2 o 5 , SrTiO 3 , Zn 2 SnO 4 etc. So far, the most excellent performance is still nano-TiO 2 semiconductor. However, the huge surface area of ​​semiconductor electrodes also increases the probability of charge recombination on the electrode surface, thereby reducing the photoelectric conversion efficiency of solar cells. To improve the photovoltaic performance of cells, TiO 2 Surface passivation and protection, people have developed ...

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Problems solved by technology

[0003] (2) Drop a certain concentration of dendritic polyester solution co-adsorbent on the surface of nano-TiO2 as a barrier layer at the semiconductor-electrolyte interface, which can effectively improve the short circuit The current density has little effect on the open circuit voltage, but the price of the polyester used is high (3806RMB / 250mg, Adrich Company) (see: Chem. Comm. 2011, 47, 1734-1736)

[0004](3) The nano-TiO2 electrode was modified with pyridine molten salt as a co-adsorbent. The open circuit voltage of the reference battery was 593mV, and the short circuit current was 8.87mAcm-2, the efficiency is 3.73%, when only niacin is used, the open circuit voltage increases to 615mV, but the short circuit current drops to 8.23 ​​mAcm-2, which eventually leads to a decrease in efficiency To 3.49%, when using pyridine molten salt, due to the inclusion of I-, only a slight increase in efficiency, increased to 4.04%-4.49%

However, we can learn from the public specification that the efficiency of the reference battery drops from 2.60% to 0.36% after one day; the efficiency of Example 1 drops from 3.22% to 3.20%, and drops to 1.98% after two days

Although the effect of modification is better than that of unmodified, the stability of the battery is still not ideal

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