Self‐Assembled Perovskite Nanoislands on CH₃NH₃PbI₃ Cuboid Single Crystals by Energetic Surface Engineering (Adv. Funct. Mater. 50/2021)

Abstract

Self‐Assembled Perovskite Nanoislands In article number 2105542, Jung‐Ho Yun, Jae Sung Yun, Lianzhou Wang, and co‐workers report an energetic surface engineering strategy to restructure non‐uniform CH3NH3PbI3 perovskite crystal surfaces. By thermally evaporating energetic CsI on single crystal surfaces, a unique nano‐island structure is formed through a cation interdiffusion process. This morphology induces a gradient band bending, which increases the charge carrier mobility by 60.

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr3 Halide Perovskite Quantum Dot Films

“…[14,15] The physical properties of defects such as grain boundaries (GBs) in polycrystalline films have been studied by scanning probe microscopy (SPM). [16][17][18][19][20][21][22] For example, surface morphology maps and root mean square surface roughness (RMS) are critical parameters obtained from atomic force microscopy AFM. [23,24] Ion migration, [25] photogenerated charge carrier separation, [26] and transport dynamics [27] through GBs defects have been understood by Exceptional electronic, optoelectronic, and sensing properties of inorganic Cs-based perovskites are significantly influenced by the defect chemistry of the material.…”