Perovskite thin film and solar cell with perovskite thin film

Abstract

The invention discloses a perovskite thin film with a passivation layer. The passivation layer is formed on the surface of the perovskite thin film by using a modification solution through a spin-coating method and a soaking method; passivation molecules of the passivation layer are composed of aryl, alkyl and functional groups; aryl is any one of arylene, heteroarylene, arylene vinylene, heteroarylene vinylene, arylene ethynylene and heteroarylene ethynylene; y in the alkyl is not less than 1; the functional group is any one of sulfydryl, amido, ammonium group, sulfate, phosphate and sulfonate. According to the passivated perovskite thin film disclosed by the invention, the passivation molecules of the passivation layer are characterized in that functional groups are arranged at the two ends of the aryl, so that the acting force between the passivation molecules and perovskite is enhanced; more importantly, when the functional groups at the two ends react with perovskite, the aryl part in the middle can cover the surface of perovskite more effectively, and structural defects are repaired; and finally, the stability of the perovskite solar cell is improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric functional materials and devices, and more specifically relates to a perovskite thin film and a preparation method thereof. Background technique [0002] So far, the power conversion efficiency of perovskite solar cells has reached 25.2% by rationally designing the device structure, improving the crystalline quality of the film, and modifying the carrier transport layer / perovskite interface. Of course, the excellent photovoltaic performance of perovskite solar cells is inseparable from the unique photoelectric properties of perovskite itself, such as high absorption coefficient, adjustable band gap, low exciton binding energy, high carrier mobility, and long carrier lifetime. and diffusion length. [0003] Defect passivation has always been an important topic for solar cells. As far as perovskite solar cells are concerned, the light-absorbing layer is a polycrystalline perovskite film prep...

AI Technical Summary

Problems solved by technology

However, these existing methods have certain limitations

The passivation molecule and the surface of the perovskite are usually bonded twice, the force is weak and not strong enough

Moreover, not all defects are charged, such as structural defects, and many structural defects that lead to degradation of perovskite films will not be effectively covered by passivating molecules

And the passivation mechanism is not fully understood

Therefore, it is crucial to explore a facile passivation method and study its passivation mechanism.

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