Review of Interface Passivation of Perovskite Layer

Abstract

Perovskite solar cells (PSCs) are the most promising substitute for silicon-based solar cells. However, their power conversion efficiency and stability must be improved. The recombination probability of the photogenerated carriers at each interface in a PSC is much greater than that of the bulk phase. The interface of a perovskite polycrystalline film is considered to be a defect-rich area, which is the main factor limiting the efficiency of a PSC. This review introduces and summarizes practical interface engineering techniques for improving the efficiency and stability of organic–inorganic lead halide PSCs. First, the effect of defects at the interface of the PSCs, the energy level alignment, and the chemical reactions on the efficiency of a PSC are summarized. Subsequently, the latest developments pertaining to a modification of the perovskite layers with different materials are discussed. Finally, the prospect of achieving an efficient PSC with long-term stability through the use of interface engineering is presented.

Enhanced Performance of Perovskite Solar Cells via Reactive Post‐treatment Process Utilizing Guanidine Acetate as Interface Modifier

“…The strong n‐type characteristic surface can promote electron transfer at the interface between the perovskite and electron‐transporting layer, increasing the photogenerated current. [ 40 ]…”

“…The strong n-type characteristic surface can promote electron transfer at the interface between the perovskite and electron-transporting layer, increasing the photogenerated current. [40] To confirm the electronic state on the perovskite surface and investigate the effects of the GA-RPP on the optoelectrical properties of the perovskite layer, scanning Kelvin probe microscopy (SKPM) and UPS measurements were performed. Figure 4a,b shows the surface potential images of CP-based and GA-RPPbased perovskite films, respectively.…”

Semitransparent Perovskite Solar Cells with > 13% Efficiency and 27% Transperancy Using Plasmonic Au Nanorods

“…Similar findings have been reported for several organic molecules with “Lewis base” functional groups, for example, thiophene, pyridine, mercaptans, or carbonyl groups. 37 These molecules assist in the passivation of Pb 2+ on the perovskite surface due to the electrons’ lone pair. In addition to that, a passivation layer can be formed by alkyl ammonium molecules, which also demonstrates better stability.…”

Application of MXenes in Perovskite Solar Cells: A Short Review

“…Among all these emerging PV technologies, PSCs are the most viable alternate offering a comparable PCE to the mature silicon solar cells. In addition, their lower cost, adjustable bandgap, low-temperature solution processability, lower exciton binding energy, high light absorption coefficients, long charge carrier diffusion lengths, multiple options of performance enhancement and significantly simpler mass production techniques bring in added advantages that conventional Si based technologies lack [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Furthermore, unlike conventional Si solar cells, PSCs also have high performance in diffused or dim lights, making them ideal for indoor applications [ 11 ].…”