Atomic-scale insight into the enhanced surface stability of methylammonium lead iodide perovskite by controlled deposition of lead chloride

Abstract

Incorporation of a certain amount of Cl ions into methylammonium lead iodide (MAPbI3) perovskite films and how these incorporated Cl ions affect the structural and electronic properties of these films...

Atomic Level Insights into Metal Halide Perovskite Materials by Scanning Tunneling Microscopy and Spectroscopy

“…Qi and co‐workers revealed the atomic‐scale surface structure of the mixed‐halide perovskite MAPbI 3− x Cl x [18j] . In addition to I‐I dimers, Cl‐I pairs with different heights and widths can also be distinguished (Figure 4 j).…”

“…Panels (e,f) are reproduced from Ref. [18j] with permission. Copyright 2021 The Royal Society of Chemistry.…”

“…Qi and co‐workers focused on the preparation of MAPbX 3 (X=Br or I) based perovskite thin films by dual‐source co‐evaporation in an UHV environment [18f,h–k] . In the case of MAPbBr 3 , MABr and PbBr 2 were evaporated at 361 and 498 K, respectively, for 10 min, while the clean Au(111) substrate was kept at 130 K during deposition to ensure the adhesion of the MABr molecules.…”

“…This layer‐by‐layer growth method with well‐defined surfaces allows precise elucidation of the structure–property relationships and is of crucial importance for the further development of MHPM solar cells. CsPbI 3 and mixed halide perovskites such as MAPbBr 3− y I y , MAPbBr 3− z Cl z , and MAPbI 3− x Cl x can also be fabricated by the vacuum deposition method [18i,j,o] . The CsPbBr 3 perovskite films could also be prepared by using the single‐source evaporation method [18r] .…”

Contactless Determination of Optimal Chloride Concentration for Power Conversion Efficiency in CH3NH3Pb(Cl,I)3 Using Photoluminescence Spectroscopy

“…These perovskite materials demonstrate rapid progress in their performance as a solar cell, the central part of which is owing to their material properties such as their direct nature in the interband transition, high absorption coefficient, and high charge carrier mobility [3][4][5]. Furthermore, since their first discovery in 2009 [6], the power conversion efficiency (PCE) is now around 25%, exceeding that of other emerging photovoltaic technologies such as dye-sensitized solar cells and organic photovoltaics [7][8][9]. These properties and the possibility of flexible synthesis have made halide perovskites promising for next-generation photovoltaics [10][11][12][13].…”