Imaging of the Atomic Structure of All-Inorganic Halide Perovskites

Hieulle, Jérémy; Luo, Sheng-Kang; Son, Dae‐Yong; Jamshaid, Afshan; Stecker, Collin; Liu, Zonghao; Na, Guangren; Yang, Dongwen; Ohmann, Robin; Ono, Luis K.; Zhang, Lijun; Qi, Yabing

doi:10.1021/acs.jpclett.9b03738

Cited by 30 publications

(29 citation statements)

References 32 publications

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“…These results are very promising because compared to their organic A‐site counterparts, 39 CsPbBr 3 perovskites appear to have a higher intrinsic stability and are more tolerant toward interfacial structural changes. Stability measurements of whole device architectures revealed a stable output over 1000 hours after an initial drop in the power conversion efficiency in the first hour 44 . This report was also the first one where the authors established a correlation between the atomistic observations by STM with relevant solar cell parameters which provides a promising path in the future.…”

Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 51%

“…Stability measurements of whole device architectures revealed a stable output over 1000 hours after an initial drop in the power conversion efficiency in the first hour. 44 This report was also the first one where the authors established a correlation between the atomistic observations by STM with relevant solar cell parameters which provides a promising path in the future.…”

Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 75%

“…Not unexpected, most of the published reports focus on the model systems, for example, MAPbBr 3 and MAPbI 3 [39][40][41][45][46][47][48]50,51 while only few studies exist for multication or mixed-halide compositions. [42][43][44]49 In addition, most of the studies were performed on single-crystals rather than spin-coated thin films. However, compared to the explosive numbers of publications focusing on lead halide perovskites in the last 11 years, the numbers presented in Figure 4 do not reflect the potential of STM.…”

Section: Resultsmentioning

confidence: 99%

“…43 In 2020, Hieulle et al reported the first STM study of an evaporated all-inorganic perovskite based on CsPbBr 3 on Au(111) which avoided the incorporation of the volatile organic species (Figure 1G,H). 44 Two distinct arrangements of Br pairs were found: armchair (Figure 1G) and striped domains (Figure 1H). The electronic characterization of the two structures by STS and differential conductance (dI/dV) revealed relatively similar properties.…”

Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 98%

“…G,H, CsPbBr 3 on Au(111). Adapted with permission: 2020, American Chemical Society 44 perovskite growth behavior, 45 vacancy migration, 46 as well as giving insight into degradation mechanisms. 47 Here, She et al studied the influence of various monolayers (ML) of evaporated MAPbI 3 films on Au(111) ranging from 0.3 ML to 4.5 ML on the interfacial surface properties.…”

Section: Dynamic Investigationsmentioning

confidence: 99%

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Nanoscale properties of lead halide perovskites by scanning tunneling microscopy

Nienhaus

2021

EcoMat

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Since the introduction of lead halide perovskites, tremendous progress has been made regarding their stability, reproducibility and durability. However, one of the issues that remains is related to the interfacial atomic structure arrangement and structure-property relationship under optical and electrical stimuli. In this critical review, we highlight the recent progress using scanning tunneling microscopy (STM) to understand the nanoscale properties and dynamic processes occurring in these halide perovskite materials. STM is known to be a very challenging technique, which is reflected by the low number of relevant publications in the last years. These initial reports mirror the unique potential of STM to give Ångstrom-scale insight into the (opto)electronic properties, morphology and underlying electronic structure and provide a path toward harnessing the full potential of these materials. However, care must be taken to understand the effects of the perturbations caused by STM and tailor the measurement conditions accordingly.

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Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 51%

Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Section: Atomic Scale Investigations At Low Temperaturesmentioning

confidence: 98%

Section: Dynamic Investigationsmentioning

confidence: 99%

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Nanoscale properties of lead halide perovskites by scanning tunneling microscopy

Nienhaus

2021

EcoMat

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Metal Halide Perovskite Surfaces with Mixed A‐Site Cations: Atomic Structure and Device Stability

Hieulle

Son

Jamshaid

et al. 2022

Adv Funct Materials

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Mixing cations in the perovskite structure has been shown to improve optoelectronic device performance and stability. In particular, CsxMA1‐xPbBr3 (MA = CH3NH3) has been used to build high‐efficiency light‐emitting diodes. Despite those advantages, little is known about the exact location of the cations in the mixed perovskite film, and how cation distribution affects device properties and stability. By using scanning tunneling microscopy , the exact atomic structure of the mixed cation CsxMA1‐xPbBr3 perovskite interface is revealed. In addition, X‐ray photoelectron spectroscopy, ultraviolet photoemission spectroscopy and inverse photoemission spectroscopy are used to study the stability and electronic properties of the CsxMA1‐xPbBr3 perovskite film. Partial substitution of MA+ by Cs+ induces a modification of the perovskite surface structure, leading to improved device stability is shown. These results provide a better understanding of the key parameters involved in the stability of mixed cation perovskite solar cells.

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Tin Halide Perovskite Epitaxial Films on Gold Surfaces: Atomic Structure and Stability

Abbasli,

Hieulle,

Schrage

et al. 2024

Adv Funct Materials

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Tin‐based halide perovskite solar cells can be efficient and environmentally friendly substitutions to lead‐based halide perovskite solar cells, but they have a drawback due to oxidation from Sn2+ to Sn4+. Using vacuum deposition, epitaxially aligned CsSnBr3 ultrathin films are prepared on Au(111) and Au(100) and characterized with scanning tunneling microscopy (STM), low‐energy electron diffraction (LEED), and X‐ray photoelectron spectroscopy (XPS). By co‐evaporation of the precursor molecules CsBr and SnBr2, few monolayers of perovskite are obtained. On Au(111), CsSnBr3 grows in three differently oriented domains due to the hexagonal symmetry of the substrate. On Au(100), which has square symmetry, identical to CsSnBr3, but with about half the lattice constant of the perovskite, a (2×2) superstructure is observed. The perovskite is terminated with the (001) facet showing a square surface structure in agreement with density functional theory (DFT) calculations. Chemical analysis is performed in ultra‐high vacuum (UHV) conditions and no indication of a tin oxidation state higher than Sn2+ is found in the films. However, after exposure to air, rapid and severe changes in the films are observed, highlighting the importance of preparing tin perovskites in a controlled environment to maintain their stability and avoid oxidation‐related issues.

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Imaging of the Atomic Structure of All-Inorganic Halide Perovskites

Cited by 30 publications

References 32 publications

Nanoscale properties of lead halide perovskites by scanning tunneling microscopy

Nanoscale properties of lead halide perovskites by scanning tunneling microscopy

Metal Halide Perovskite Surfaces with Mixed A‐Site Cations: Atomic Structure and Device Stability

Tin Halide Perovskite Epitaxial Films on Gold Surfaces: Atomic Structure and Stability

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