The dense TiO₂ layer and mesoporous TiO₂ layer play a vital role in solar cells and other devices. They each have unique functions and properties, which jointly affect the performance and stability of the device.
1. Improve photoelectric conversion efficiency and stability
One of the main functions of the dense TiO₂ layer is to improve the photoelectric conversion efficiency and stability of the titanium dioxide film. Due to its dense structure, it can effectively prevent the diffusion of external impurities and air molecules inside the film, thereby protecting the internal materials from contamination and oxidation. This protective effect allows the material to maintain its original optoelectronic properties and improve the long-term stability of the device.
2. As a channel for electron transmission
In devices such as solar cells, the dense TiO₂ layer can also serve as a channel for electron transmission. Due to its good conductive properties, it can effectively transport photogenerated electrons into external circuits, thereby improving photoelectric conversion efficiency. In addition, the dense TiO₂ layer also blocks holes, which helps reduce the recombination of electrons and holes and further improves the performance of the device.
3. Block the recombination of electrons in the conduction band of the electrode and holes in the valence band of the perovskite
In perovskite solar cells, dense TiO₂ layers are often used as inorganic electron transport materials. Its main function is to reduce the potential barrier in electron transmission and block the recombination of electrode conduction band electrons and perovskite valence band holes. This blocking effect helps reduce energy loss, improve the current density and fill factor of the device, and thereby improve the overall photoelectric conversion efficiency.
1. Increase the contact area with the perovskite layer
The mesoporous TiO₂ layer has a porous structure, which gives it a larger specific surface area. In devices such as solar cells, the mesoporous TiO₂ layer can form closer contact with the perovskite layer, thereby increasing the contact area between the two. This increased contact area helps enhance the separation capability of carriers (electrons and holes) and improves device performance.
2. Improve catalytic activity
The mesoporous TiO₂ layer can also improve the catalytic activity of titanium dioxide materials. Due to its porous structure and large specific surface area, the mesoporous TiO₂ layer can provide more active sites, allowing photogenerated electrons and holes to participate in chemical reactions more effectively. This enhanced catalytic activity helps improve the photoelectric conversion efficiency and stability of the device.
3. Enhance light absorption ability
The porous structure of the mesoporous TiO₂ layer can also enhance the light absorption capability of the material. When light irradiates the mesoporous TiO₂ layer, the light can be reflected and refracted multiple times in the porous structure, thereby increasing the propagation path and absorption depth of the light. This enhanced light absorption capability helps increase the short-circuit current and open-circuit voltage of the device, thereby improving the overall photoelectric conversion efficiency.
In devices such as solar cells, dense TiO₂ layers, and mesoporous TiO₂ layers are often used in combination to exert their synergistic effects. The dense TiO₂ layer serves as a channel and barrier layer for electron transmission, which can improve the photoelectric conversion efficiency and stability of the device. In contrast, the mesoporous TiO₂ layer increases the contact area with the perovskite layer, improves catalytic activity, and enhances light absorption capabilities. Further, improve device performance. This combined use can make full use of the advantages of the two TiO₂ layers to achieve more efficient and stable photoelectric conversion.
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