Stabilization of Inorganic Perovskite Solar Cells with a 2D Dion–Jacobson Passivating Layer

Abstract

Inorganic metal halide perovskites such as CsPbI3 are promising for high‐performance, reproducible and robust solar cells. However, inorganic perovskites are sensitive to humidity, which causes the transformation from the black phase to the yellow δ, non‐perovskite phase. Such phase instability has been a significant challenge to long‐term operational stability. Here, we report a surface dimensionality reduction strategy, using 2‐(4‐aminophenyl) ethylamine cation to construct a Dion‐Jacobson 2D phase that covers the surface of the 3D inorganic perovskite structure. The Dion‐Jacobson layer mainly grew at the grain boundaries of the perovskite, effectively passivating surface defects and providing favourable interfacial charge transfer. The resulting inorganic perovskite films exhibited excellent humidity resistance when submerged in an aqueous solution (Isopropanol: Water = 4: 1v/v) and exposed to a 50% humidity air atmosphere. The DJ 2D/3D inorganic perovskite solar cell (PSC) achieved a power conversion efficiency (PCE) of 19.5% with a Voc of 1.197 eV. It retained 83% of initial PCE after 1260 h of maximum power point tracking under 1.2 sun illumination. Our work demonstrates an effective way for stabilising efficient inorganic perovskite solar cells.This article is protected by copyright. All rights reserved

Solution-Processed Ternary Perovskite-Conjugated Polymer Photodetector with a Photoresponse up to 1200 nm

“…The same as the 3D MAPbI 3 thin film, both PPA 2 PbI 4 :MAPbI 3 and (PPA 2 PbI 4 :MAPbI 3 ):NDI-DPP composites possess tetragonal crystal structure. However, in addition to the diffraction rings for the 3D MAPbI 3 thin film, the diffraction arch at q r = 0.4, which corresponds to the (001) plane of the 2D PPA 2 PbI 4 phase, is visible in the PPA 2 PbI 4 :MAPbI 3 composite thin film . Moreover, with NDI-DPP mixed with the PPA 2 PbI 4 :MAPbI 3 , the (PPA 2 PbI 4 :MAPbI 3 ):NDI-DPP thin film possesses diffraction peaks in the 2D-α and 2D-β phases (Figure a–c), indicating that NDI-DPP could induce the PPA 2 PbI 4 :MAPbI 3 composite thin film to grow along the vertical direction.…”

High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering

“…This would be one of the reasons that the hydrophobic perovskite with 3-BAS exhibits improved moisture stability in air. 36 To investigate the ion migration in perovskite, we conducted forward and reverse current-voltage scanning for both control and targeted devices. As shown in Figs.…”

Self-assembled metal-oxo clusters for sensitive and low-powered ultraviolet photodetectors

“…3c compares the SCLC-derived trap density and bandgap values of the ZOCs and benchmark UV-sensitive materials. The trap densities of ZOCs are significantly lower than those of wide-bandgap metal oxides and metal nitrides (such as ZnO, Ga 2 O 3 , TiO 2 , and GaN) and comparable to those of organic/inorganic narrow-bandgap perovskites (such as Cs-FAPbI 3 , MAPbI 3 , FAMACs, and (FAPbI 3 ) 0.97 (MAPbBr 3 ) 0.03 ), 1,28–46 suggesting that the as-prepared ZOCs can serve as promising UV photoactive materials that exhibit both high UV selectivity and efficient photon-induced charge collection. Moreover, the trap density of ZOC@PEI was significantly higher than that of ZOC, implying that the ZOC/PEI interfaces can act as electron-trapping sites.…”