Improvement in solar cell efficiency based on the MAPbI3 films extracted by a mixed anti-solvent

Abstract

In this report, we discuss the 22% efficiency improvement of solar cells based on the MAPbI3 perovskite film extracted with a mixed anti-solvent. The film quality of MAPbI3 extracted from the mixed anti-solvent of ether and isopropanol is improved greatly. The average grain size of the film may be enlarged twice. We argue that some solvents residing in the precursor may effectively promote the crystallization process of MAPbI3 to form large grains. We believe that this study may open a method to fabricate high-quality MAPbI3 perovskite films for highly efficient solar cells.

Analysis of the Oxygen Passivation Effects on MAPbI3and MAPbBr3in Fresh and Aged Solar Cells by the Transient Photovoltage Technique

“…This was done considering the slower evolution observed in the bromide‐based perovskite composition and for both perovskites no more changes were further observed. The performances obtained are within the average of those recently reported in the literature, [25,26] making both perovskite composition fairly comparable.…”

Improvement in Efficiency and Reproducibility for FAPbI3 Solar Cells with Rapid Crystallization

“…In the two-step case, it usually needs to form the lead salt· x Sol (Sol = solvent) first. Thus, to achieve that goal, it requires a long time of annealing to completely eliminate the excess of those high boiling point solvents, such as dimethylformamide, dimethyl sulfoxide, γ-butyrolactone, etc. − (III) With annealing for a long time (10 min or more), the pure α-FAPbI 3 film can be decomposed into bright yellow PbI 2 grains, which has detrimental effects on the visible light absorption and photogenerated carrier transport, thus reducing the efficiency, reproducibility, and stability of the solar cells . However, previous reports also found that moderate PbI 2 crystals can passivate the surface and grain boundaries, which means that the annealing time needs to be precisely controlled to obtain moderate PbI 2 crystals, thus enhancing the efficiency of the solar cells.…”

Improving the Quality of CsPbBr3 Films by Applying the Light Soak

“…At present, a common method is to conduct thermal annealing to obtain CsPbBr 3 films with good crystallization and morphology, , but the defect density of the CsPbBr 3 films is still high. Moreover, many traditional passivation methods, such as anti-solvent engineering and gradient crystallization treatment, , are not applicable to CsPbBr 3 films owing to the difference in the concentration of the raw material solution. It is necessary to develop a suitable method to passivate CsPbBr 3 films.…”