Tailoring Two-Dimensional Ruddlesden–Popper Perovskite via 1D Perovskitoid Enables Efficient and Stable Solar Cells

Abstract

Ruddlesden−Popper (RP) perovskite solar cells (PSCs) have received increasing attention due to their promising optoelectronic properties. Herein, based on low-dimensional engineering, we employ the 1D perovskitoid BZPbI 3 (BZ = benzamidine) to tailor the (4F-PEA) 2 (FA 0.3 MA 0.7 ) 4 Pb 5 I 16 perovskite, obtaining the 1D/ 2D mixed low-dimensional perovskite with favorable phase distribution, orderly crystal orientation, and lower defect density. Furthermore, the 1D BZPbI 3 induces a large number of particles to form on the surface, considerably increasing the electrical quality and intrinsic stability of PSCs. Consequently, the 1D/2D PSCs (n = 5) reach a power conversion efficiency (PCE) approaching 20%, accompanied by improved electroluminescent external quantum efficiency. The devices show admirable long-term operational stability, retaining 85% of their initial PCE after continuous illumination at maximum power point (MPP) over 2000 h (50 ± 5 °C). This work illustrates the advantages of 1D perovskitoid in achieving efficient and stable 2D perovskite photovoltaic and other optoelectronic devices.

Crystallization Regulation by Self‐Assembling Liquid Crystal Template Enables Efficient and Stable Perovskite Solar Cells

“…The stabilized current densities at the maximum power points also demonstrate an effectively improved current density after ILC modification (Figure 4c), which is mainly attributed to the enhanced photoelectric conversion efficiency in the long wavelength region (Figure 4b). [54,55] The dark J–V curves depicted in Figure 4d confirm the lowest leakage current for ILC‐modified PSC, which originates from the lowest trap density and less carrier recombination, contributing to the enhanced V oc and FF [56] . The statistics of the PCE verses V oc (40 independent devices for each type) reveal that the ILC modification can obviously improve the PCE and V oc , and the ILC‐modified devices possess good repeatability (Figure 4e and S21).…”

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

“…The divalent-cation and "large-small" alternating-cation layer configurations [ 51 , 52 ], which produce significant chemical changes [ 53 , 54 ], are the essential features that separate DJ from RP phases.…”

The Modulation of the Optical Properties of Low‐Dimensional Hybrid Perovskite by Using Anchoring Groups and Biaxial Strain: A First‐Principles Study

“…It is noteworthy that anchoring groups have a significant effect on the photovoltaic performance of low‐dimensional perovskites. [ 33–35 ] The anchoring group/low‐dimensional hybrid perovskite systems incorporate amines, Lewis acids/bases, and halogens at the molecular interfaces, and utilize intermolecular forces such as hydrogen bonding and halogen bonding to improve the photovoltaic performance of halide perovskites from the molecular interfaces is also a new and effective approach. [ 36–42 ] In addition, since strain engineering can tune the bandgap, which in turn has an impact on the optical properties of the material, the application of strain on halide perovskite structures to effectively tune the material properties is widely used.…”