Multifunctional Metal‐Organic Frameworks Capsules Modulate Reactivity of Lead Iodide toward Efficient Perovskite Solar Cells with UV Resistance

Abstract

The two‐step sequential deposition process is demonstrated as a reliable technology for the fabrication of efficient perovskite solar cells (PVSCs). However, the complete conversion of dense PbI2 to perovskite in planar PVSCs is tough without mesoporous titanium dioxide as support. Herein, multifunctional capsules consisting of zeolitic imidazolate framework‐8 (ZIF‐8) encapsulant and formamidinium iodide (FAI) are introduced between tin oxide (SnO2) and lead iodide (PbI2) layer. Intriguingly, the capsule dopant interlayer benefits the formation of porous PbI2 film due to the porous nanostructure of ZIF‐8 that is favorable for the subsequent intercalation reaction. Furthermore, the constituent of the perovskite precursor in ZIF‐8 pores can convert into the crystal nuclei of perovskite by reacting with PbI2 first, thereby promoting further perovskite crystallization. Significantly, the incorporation of ZIF‐8 can enhance the resistance of perovskite against UV illumination due to down‐conversion effect. Consequently, the modified device achieves a champion power conversion efficiency (PCE) of 24.08% and displays enhanced UV stability, which can sustain 83% of its original PCE under 365 nm UV illumination for 300 h. Moreover, the unencapsulated device maintains 90% of initial PCE after 1500 h storage in dark ambient conditions with a relative humidity range of 50%–70%.

Functional cellulose paper with high transparency, high haze, and UV-blocking for perovskite solar cells

“…Therefore, cellulose can interact with light in various ways, enabling the creation of transparent and tunable haze materials. Considering the challenge of shortened lifetime in PSCs under prolonged UV exposure [12,23], here, based on the existing papermaking industry platform, a transparent, hazy, and UV-blocking paper was designed and prepared by using CMC-Na and TA as functional llers (Fig. 1).…”

Crystalline porous materials in perovskite solar cells: a mutually beneficial marriage

“…Consequently, the modified PSCs achieved 24.08% champion performance with significant ultraviolet resistance. 76…”

Annual research review of perovskite solar cells in 2023

“…Studies conducted in 2023 on the ETLs in n-i-p PSCs primarily focused on adjusting band structures and surface states via doping [6,7] and interface modification [8][9][10]. These modifications successfully passivated interface defects and enhanced charge carrier extraction and transport capabilities, ultimately yielding highperformance devices.…”