Organic photosensitizer and preparation method and application thereof

Abstract

The invention relates to an organic photosensitizer and a preparation method and application thereof. The organic photosensitizer is characterized in that phenothiazine (or phenoxazine) is treated asan electron donor, and three independent light-harvesting units and a plurality of absorbing groups are provided; the organic photosensitizer has the structure as shown in formula (VII), wherein definitions of R1, R2, R3, R4, X1, X2, P and L can be seen in the specification. The invention also provides the preparation method of the organic photosensitizer and the application of the organic photosensitizer in a dye-sensitized solar cell. The organic photosensitizer is wide in spectral response range and high in molar adsorption coefficient, and is high in absorbing performance on a TiO2 film. The organic photosensitizer applicable to the preparation of the dye-sensitized solar cell is capable of producing high short-circuit current density (Jsc); the assembled dye-sensitized solar cell is high in photoelectric conversion efficiency (eta).

Description

technical field [0001] The invention belongs to the field of synthesis and application of optical functional materials, and relates to an organic photosensitive dye and its preparation method and application. Background technique [0002] Due to the prominent problems of energy shortage, greenhouse effect, and air pollution caused by the use of traditional fossil energy, it has become a global consensus to develop alternative new energy and promote a low-carbon economy. Due to the unique advantages of solar energy such as safety and "zero" carbon emissions, the development and utilization of clean and abundant solar energy has become a hot spot in the world. Dye-sensitized solar cells (DSCs), whose working principle is similar to plant photosynthesis, have become a device with great potential to realize photoelectric conversion by using solar energy because of its simple preparation, low manufacturing cost and good application prospects. 1991 (O'Regan B., M.Nature, 1991,...

AI Technical Summary

Problems solved by technology

[0004] D-D-π-A, D-A-π-A structure of organic photosensitive dyes, there is only a single D-π-A structure so that the molar absorptivity is small, and at the same time has a TiO on the photoanode 2 Membrane-bound adsorption groups, a photogenerated electron generated after light absorption can only be injected into TiO through a D-π-A transport channel 2 The conduction band enters the external circuit, and the short-circuit current density generated is not large; A-π-D-π-A and (D-π-A) 2 The structure of the dye has two photoanodes on TiO 2 Membrane-bound adsorption groups, two photogenerated electrons generated after light absorption can be injected into TiO through two D-π-A transport channels 2 The conduction band and enter the external circuit, but the dyes with the A-π-D-π-A structure share an electron donor, which is still a single D-π-A structure, and its molar absorptivity is still not high enough to make the short-circuit current density The improvement is limited, (D-π-A) 2 Although the structural dye contains two independent D-π-A structures, there are still defects such as low molar absorptivity and low short-circuit current density.

Images