Hierarchy of interfacial passivation in inverted perovskite solar cells

Abstract

The crucial hierarchy of the interfacial passivation at different positions of perovskite solar cells together with the corresponding mechanism has been studied despite the selection of passivation mediums in this work.

Passivation and process engineering approaches of halide perovskite films for high efficiency and stability perovskite solar cells

“…This hierarchy in interfacial passivation was attributed to the ''reparation'' effect of the utilized passivation medium on the perovskite layer, as it induced both ''interfacial'' and ''bulk'' effects by effectively filling the grain boundaries of the perovskite layer and reducing the trap state density in both the perovskite layer and the interface between it and the upper carrier transport layer. 168 A PCE of 19.55% and a V OC of 1.133 V with negligible hysteresis and better long-term and thermal stability were achieved for the champion devices with an upper passivation layer of polystyrene (PS) or polymethyl methacrylate (PMMA). Moreover, an ultrathin passivation layer consisting of a PMMA:PCBM mixture was highly effective in passivating interfacial defects near the perovskite/TiO 2 interface, significantly suppressing interfacial recombination.…”

Multifunctional Molecule Assists Passivate Method to Simultaneously Improve the Efficiency and Stability of Perovskite Solar Cells

“…They found that passivation on the upper interface is generally more efficient than on the lower interface in inverted PSCs. In the end, the highest PCE of 19.55 % was achieved by using the upper interface passivation strategy [10] . In 2022, Li et al reported the 4‐[(trifluoromethyl) sulphonyl]‐aniline (4TA) with trifluoromethyl (−CF 3 ) and aniline (−NH 2 ) functional groups have strong interaction with Pb 2+ ions, which can suppress surface defects and delay crystallization.…”

“…In the end, the highest PCE of 19.55 % was achieved by using the upper interface passivation strategy. [10] In 2022, Li et al reported the 4-[(trifluoromethyl) sulphonyl]-aniline (4TA) with trifluoromethyl (À CF 3 ) and aniline (À NH 2 ) functional groups have strong interaction with Pb 2+ ions, which can suppress surface defects and delay crystallization. The À CF 3 group can form a hydrophobic protective layer to prevent water invasion for perovskite film.…”