Modulating Chemical Interaction to Realize Bottom‐Up Defect Passivation for Efficient and Stable Perovskite Solar Cells

Abstract

The defects of perovskite and SnO2 layers, interfacial energy barrier, and high grain boundary density impede further development of perovskite solar cells. Herein, a bottom‐up versatile modification strategy, which is implemented via introducing Lewis base ligand molecules containing different numbers of carbonyls (urea, propanedioic acid, and barbituric acid [BA]) into SnO2 colloidal solution, is reported. All modifiers exhibit positive but different defect passivation effects for both SnO2 and perovskite layers. The defect passivation effect can be rationally modulated by tuning the number of carbonyls and is directly proportional to the number of carbonyls. The enlargement sequence of the grain size is the same as that of the defect passivation effect. Meanwhile, the interfacial energy barrier, charge accumulation, and hysteresis are mitigated after modification, which is principally attributed to improved energy band alignment, reduced interfacial defects, and improved electrical properties of SnO2 films. The BA‐modified device achieves an impressive efficiency up to 23.35%, which is significantly higher than 21.59% of the reference device. In addition, the modified devices demonstrate enhanced moisture and thermal stabilities.

Targeting the imperfections at the ZnO/CsPbI2Br interface for low-temperature carbon-based perovskite solar cells

“…6f–g), which is closely related to passivated film defects, released interfacial residual strain, and inhibited halide ion migration, as was discussed above. 31…”

“…5c-f and Table S13, ESI †), which may be attributed to reduced charge accumulation, passivated lm defects, and inhibited halide ion migration. 14,31,69 Fig. S31a (ESI †) shows the steady-state short-circuit current density (J sc ) proles within 400 s at the maximum power point.…”

“…14,22,29,30 To simplify the fabrication procedures, the above functions can also be realized by directly incorporating interfacial molecules into ETLs. [31][32][33] However, there is no report of such a study in ZnO-based C-IPSCs.…”

Regulating the Interplay at the Buried Interface for Efficient and Stable Carbon-Based CsPbI2Br Perovskite Solar Cells

“…As shown in Figure d, the EAD-modulated device maintained 81% of initial PCE after 24 days, while the reference C-IPSC showed a much faster decline (about 58%) under the same condition. The improved thermal stability could be attributed to reduced film defects, released interfacial stress, and inhibited halide ion migration. , …”

Amino-bridged attapulgite@perovskite nanocomposites: the role of bridge linkage in their optical properties and stabilities

“…This approach offers several advantages, including the introduction of a more stable guest material as a matrix protector layer to prevent the direct exposure of perovskites to the environment, ensure minimal fluorescence quenching for high-quality luminescence, and provide interfacial engineering to explore unique properties for a broader range of applications. [30][31][32] For instance, Hao et al used rich hydroxyl groups on the surface of halloysite nanotubes to generate surface adsorption and covalent grafting to perovskite nanocrystals (NCs). This resulted in the formation of a halloysite@perovskite nanocomposite with significantly improved thermal stability and photostability.…”