Abstract
In recent years, perovskite solar cells have been developed rapidly because of its excellent crystalline properties, high optical absorption coefficient, high carrier mobility, long carrier life and direct band gap, and suitable to be used as light absorbing layer material of photovoltaic devices. However, the most prominent problem of perovskite materials is that a lot of organic cations will migrate and lose in the process of illumination or heating, which is considered to be the main reason for the performance degradation of perovskite films and devices. Therefore, the suppression of ion migration in perovskite is helpful to improve the stability of perovskite materials and devices and enhance their photoelectric properties. In order to effectively control the ion migration in perovskite films, this paper uses the cation-π supramolecular interaction, to prepare the perovskite films with better photoelectric performance and higher stability. The experimental results show that the photoelectric conversion efficiency of the perovskite solar cellsdevice doped with rubrene is increased from 18.60% to 20.86%, and the hysteresis of the cell is also significantly suppressed.
Highlights
Perovskite solar cells have the characteristics of low cost and high performance, and their photoelectric conversion efficiency has been greatly improved in a few years
This phenomenon of ion migration is considered to be the main reason for the performance degradation of perovskite films and devices, and it can not be solved by means of packaging or adjusting components
The phenomenon of ion migration in perovskite is a problem of perovskite material itself, which seriously affects the stability of perovskite films and devices
Summary
Perovskite solar cells have the characteristics of low cost and high performance, and their photoelectric conversion efficiency has been greatly improved in a few years. The most prominent problem is that there will be a lot of migration and loss of organic cations in the process of illumination or heating This phenomenon of ion migration is considered to be the main reason for the performance degradation of perovskite films and devices, and it can not be solved by means of packaging or adjusting components. We found that the cation-π interaction between rubrene and perovskite can effectively limit the migration of cations in perovskite, inhibit the generation of defects and improve the stability of perovskite films. Through this method, we have prepared more stable perovskite films, and the corresponding battery devices show excellent photoelectric performance and stability
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have