In this work, two-dimensional (2D) perovskite absorbers with the chemical formula BA2MAn–1PbnI3n+1 (MA: methylammonium and BA: butylammonium) with different n values and different synthesis conditions are investigated, and their preferential growth and segregation patterns have been thoroughly ...
2D perovskites are perovskite materials with a layered crystal structure. They are made up of metal-halide sheets, separated by large organic cations called spacers. This layered 2D structure changes the optical and electronic properties of the material
MXenes are a novel class of 2D materials composed of transition metal carbides, nitrides, or carbonitrides. The general formula of MXenes isMn+1XnTx, whereMrepresents a transition metal,Xstands for C and/or N element,Tdenotes surface terminations such as -OH, =O, and -F, andn = ...
perovskite structure was found to be able to either improve or worsen the stability compared to a pure DJ perovskite, depending on the cation used, which was attributed to defect passivation and film morphology and crystallinity improvement14. In addition, it has been reported that quasi-2D RP m...
Due to the randomness and uncontrollability of perovskite nucleation and crystallization in the precursor solution, it is necessary to use a template constraint to strictly control the crystallization kinetics of the perovskite, thereby obtaining uniformly surface-patterned MPs. In this work, the surface...
2005 0.2 0.12 3D perovskite 0.0 12345 n 1234 n Fig. 1 Exciton reduced mass from magneto-absorption spectroscopy and theory. a Schematic of the RPP structure cut along the direction ĉ of stacking of the 2D layers. b Image of mechanically exfoliated RPP crystals. Scale bar is 10 µm. ...
Figure 1. Crystal Structure of the DJ and RP Phases Shown in (A) is DJ phase (4AMP)(MA)6Pb7I22 and in (B) is RP phase (BA)2(MA)6Pb7I22. Top-down view of the layers are in (C) (4AMP)(MA)6Pb7I22 and (D) (BA)2(MA)6Pb7I22. The layers of DJ perovskite lay on...
(also referred to as ligand molecules) which transform part of the surface into RDPs (Fig.1a). The thickness of these RDPs is designated by the number of layers (n) of perovskite octahedra that are enclosed by the ligand cations in the crystal structure. Purely 2D (n = 1) RDPs ...
Emerging two-dimensional (2D) materials offer significant potential for post-silicon photodetectors but often fall short of matching silicon photodiode performance. Here, we report a flexible, high-performance photodetector with a simple metal-2D semiconductor-metal structure by stacking Ti/WSe2/Ag laye...
structure with strong in-plane bonds, where layers are coupled together by weak van der Waals (vdW) forces. Currently, hundreds of 2D materials are known12,13. Many are natural semiconductors, along with metals and insulators. Because of the weak bonding between layers, numerous heterostructures ...