Additive Engineering for High‐Performance Two‐Dimensional Dion–Jacobson Pb–Sn Alloyed Perovskite Solar Cells

Abstract

Two‐dimensional perovskite materials attract great attentions for the application of perovskite solar cells (PSCs) due to the regulable bandgap and high stability. However, the power conversion efficiency (PCE) of 2D PSCs is far behind in that of three‐dimensional PSCs. Herein, Dion–Jacobson (DJ) phase Pb–Sn perovskite of (PhDMA)MA4(Pb0.5Sn0.5)5I16 in 2D PSCs is introduced, which has suitable bandgap of 1.27 eV and offers the candidate for the absorber of bottom device in all perovskite tandem solar cells. The nonlinear bandgap behavior of 2D Pb–Sn perovskite materials is certified by adjusting the recipe of precursors to vary the bandgap of perovskite films. Moreover, MACl is employed to improve the film quality of 2D Pb–Sn perovskite, leading to the suppression of the defect density and nonradiative recombination for 2D PSCs. As a result, a high PCE of 12.2% is achieved for DJ phase 2D Pb–Sn PSCs.

Efficient quasi-2D tin perovskite solar cells based on mixed monoammonium and diammonium terminal molecules

“…There is a clear Debye ring that can be observed at q = 0.35 Å À1 , which can be ascribed to the character signal of XDAFASn 2 X 7 . 30 Another weaker diffraction ring around q = 0.69 Å À1 can be considered as the secondary diffraction of the former. The emergence of low-dimensional signals in XDA 0.1 FA 0.8 SnX 3 films demonstrates that XS 2 molecules can reduce the distance between the [SnI 6 ] 4À layers (Fig.…”

Additive Engineering for Stable and Efficient Dion–Jacobson Phase Perovskite Solar Cells

“…Chloride is a common addition for passivation (Cl − ) [ 85 ]. Cl − significantly lowers trap density and enhances charge durations of diffusion and carrier lives in DJ halide perovskite films [ 104 , 105 ]. DJ phase Pb–Sn PVK of (PhDMA)MA 4 (Pb 0.5 Sn 0.5 ) 5 I 16 in 2D PSCs is used with MACl additive [ 105 ].…”

“…Cl − significantly lowers trap density and enhances charge durations of diffusion and carrier lives in DJ halide perovskite films [ 104 , 105 ]. DJ phase Pb–Sn PVK of (PhDMA)MA 4 (Pb 0.5 Sn 0.5 ) 5 I 16 in 2D PSCs is used with MACl additive [ 105 ]. MACl is adopted to enhance the layer quality of 2D Pb–Sn PVK, enabling the suppression of the trap density and nonradiative recombination for DJ PSCs.…”

“…The uniformity, coverage, and roughness of a surface are all influenced by the size and distribution of the grains, the texture, and pinholes in the films [ 156 , 157 ]. The optimal situation is that PVK form a single crystal sheet on the substrate [ 105 , 158 , 159 ]. The nucleation, growth, and post-treatment stages of crystallization, as well as the coarsening or ripening process, can all be controlled to optimize the morphology [ 160 ].…”

Engineering the intermediate adduct phase to control the crystallization of perovskites for efficient and stable perovskite solar cells

“…At the beginning of composition engineering research, this adduct (PbI 2 ÁMAIÁDMSO) was thoroughly studied in MAPbI 3 perovskite. 24,26,27 Later, Seok et al manipulated the formation of a Lewis base adduct via molecular exchanges between FAI and DMSO. 28 In 2019, Wang et al noticed that even the system of mixed cation perovskite precursors with the MA cation still existed as PbI 2 ÁÁMAIÁDMSO.…”