A bilayer TiO₂/Al₂O₃ as the mesoporous scaffold for enhanced air stability of ambient-processed perovskite solar cells

Abstract

Research on the air stability of perovskite solar cells (PSCs) has attracted great attention in the field of photovoltaics. Although device based on lead halide perovskites showing outstanding efficiency, commercialization...

Recent Developments in Upscalable Printing Techniques for Perovskite Solar Cells

“…Several mesoporous materials, including TiO 2 , Al 2 O 3, and ZrO 2, are highly used for the mesoporous PSCs. [35][36][37] However, the PSC with the mesoscopic structure containing mesoporous TiO 2 as an ETL has delivered a maximum efficiency of 25.6%. [21] The mesoporous PSCs generally consists of a dense TiO 2 compact layer deposited on the transparent conducting oxide (TCO) surface (fluorine-doped tin oxide, FTO), a mesoporous TiO 2 layer, which is thoroughly infiltrated by the perovskite absorber, a perovskite overlayer, an organic hole transport layer and a metal electrode (Figure 1a).…”

Charge transport materials for mesoscopic perovskite solar cells

“…As a result, it delivered a high PCE of 16.84% which retained 82% of its value after 2000 h storage in ambient air without any optical losses. 78 In a different approach, semiconducting GQDs were used as passivation layer in TiO 2 based mp-PSC facilitating electron extraction from the perovskite layer to the TiO 2 ETL and thus increasing PCE. 79 GQDs (o5 nm) decorated on the TiO 2 surface led to a more effective interfacial electron transport and extraction which synergistically led to an optimized PCE of 20.45%.…”

“…As a result, it delivered a high PCE of 16.84% which retained 82% of its value after 2000 h storage in ambient air without any optical losses. 78…”

Interfacial engineering of mp-TiO2/CH3NH3PbI3 with Al2O3: Effect of different phases of alumina on performance and stability of perovskite solar cells

“…At the moment, the champion cell belongs to mp-TiO 2 architecture and the other configurations lag behind, suffering from hysteresis [35][36][37][38]. Unfortunately, perovskite solar cells have proven to be very defenseless to environmental stresses, and the efficiency drops gravely when the cells are kept in ambient air for even a short time [39][40][41][42][43][44][45][46]. This instability is especially pronounced when the perovskite solar cells are exposed to environments with high humidity.…”