Application of a class of D-π-A type passivation molecules with benzotricarbazole as donor in perovskite solar cells
By using D-π-A type molecule AJ206 to passivate the defects in perovskite solar cells, the problems of carrier recombination and low efficiency are solved, and the photoelectric conversion efficiency is improved and the water-oxygen stability is enhanced.
CN115224197BActive Publication Date: 2025-03-21DALIAN UNIV OF TECH
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Patent Information
- Application Number
- CN202210451334.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-08
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2042-09-08
AI Technical Summary
Technical Problem
There are defects in perovskite solar cells, which affect their photovoltaic parameters, resulting in non-radiative recombination of carriers and reducing battery efficiency.
Method used
The D-π-A type molecule AJ206 is used as the passivation molecule to passivate the unbonded lead ions in the crystal lattice by interacting with lead ions, and passivate the methylamine defect through the deprotonation of carboxylic groups, thereby improving the hydrophobic ability of the perovskite film.
Benefits of technology
It effectively reduces carrier recombination, improves the photoelectric conversion efficiency, from 17.31% to 19.84%, and enhances the water-oxygen stability of the battery.
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Abstract
The present invention provides a D-π-A type molecule with benzotricarbazole as a donor, and also provides a D-π-A type molecule with benzotricarbazole as a donor as a passivator for use in the passivation of perovskite film defects, wherein the carboxyl group thereon can interact with lead ions, thereby passivating the unbonded lead ions in the lattice and reducing the recombination of photogenerated carriers. Moreover, the photosensitive dye itself contains a large conjugated system, which is beneficial to the transmission of photogenerated carriers in the perovskite, thereby improving the photoelectric conversion efficiency of the device. In addition, the deprotonation of the carboxyl group thereon can passivate the methylamine defects in the perovskite film, and the more alkyl chains in the molecule also improve the hydrophobicity of the perovskite film, effectively improving the water-oxygen stability of the battery. After passivation, the various photoelectric properties of the device are significantly improved, and the photoelectric conversion efficiency (PCE) is increased from 17.31% to 19.84%.
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