Solvothermal Synthesis and Crystal Structure Determination of AgBiI4 and Ag3BiI6.

Oldag, Thorsten; Aussieker, Thomas; Keller, H.‐L.; Preitschaft, Christian; Pfitzner, Arno

doi:10.1002/chin.200523007

Cited by 8 publications

(11 citation statements)

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“…This partially occupied AgBi 2 I 7 octahedral-coordination framework can yield either a rhombohedral CdCl 2 -layered structure (R3̅ m space group) or a cubic defect-spinel structure (Fd3̅ m space group) similar to AgBiI 4 . 33,40,43 Fitting the current experimental XRD data for as- 2a), respectively, consistent with previously published reports. 33,44 Given the relatively stable composition of the silver bismuth iodide films during the postdeposition anneal (Table S1), this phase transition from rhombohedral to cubic symmetry for the AgBi 2 I 7 films during annealing may result from a higher thermodynamic stability of the cubic defect-spinel structure versus the CdCl 2 -type structure, at least at elevated temper-ature.…”

Section: ■ Results and Discussionsupporting

confidence: 91%

A Versatile Thin-Film Deposition Method for Multidimensional Semiconducting Bismuth Halides

et al. 2018

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Despite the significant progress in fabricating hybrid organic− inorganic lead halide perovskite solar cells, their toxicity and low stability remain as major drawbacks, thereby hindering large-scale commercialization. Given the isoelectronic nature of lead(II) and bismuth(III) ions, potentially stable and nontoxic alternatives for efficient light absorption in thin-film photovoltaic (PV) devices may be found among bismuth-based halide semiconductors. However, high-quality polycrystalline films of many of these systems have not been demonstrated. Here we present a versatile and facile two-step coevaporation approach to fabricate A 3 Bi 2 I 9 (A = Cs, Rb) and AgBi 2 I 7 polycrystalline films with smooth, pinhole-free morphology and average grain size of >200 nm. The process involves an initial two-source evaporation step (involving CsI, RbI or AgI, and BiI 3 sources), followed by an annealing step under BiI 3 vapor. The structural, optical, and electrical characteristics of the resulting thin films are studied by X-ray diffraction, optical spectroscopy, X-ray/UV photoelectron spectroscopy, and scanning electron microscopy.

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Section: ■ Results and Discussionsupporting

confidence: 91%

A Versatile Thin-Film Deposition Method for Multidimensional Semiconducting Bismuth Halides

et al. 2018

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“…8 The BEs of both Ag3d and I3d levels in Ag 3 BiI 6 are close to that in AgI and BiI 3 . This is expected, since, in the R-3 m structure of Ag-Bi-I rudorffites, each metal cation is octahedrally coordinated by iodines, 4,21 as in both AgI and BiI 3 . Indeed, the XPS of thin films also shows practically no shift in the positions of Ag and I3d BEs between AgBi 2 I 7 , Ag 2 BiI 5, and AgBiI 4 crystals.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

“…For structural characterization, the samples were precipitated onto an oriented silicon substrate from the AgI/BiI 3 DMSO solution at 120 °C. The XRD pattern in Figure a exhibits reflections that correspond to the rhombohedral structure of Ag 3 BiI 6 (R-3 m space group), as well as a small contribution of the AgI phase. A similar XRD pattern of Ag 3 BiI 6 thin films annealed at 400 K was reported by Turkevych et al The UV–vis absorption spectra (Figure S3a) of the Ag 3 BiI 6 particles dispersed in acetonitrile, as well as of the Ag 3 BiI 6 films deposited on a quartz substrate, showed absorption edges at ∼2.2 and ∼1.7 eV, respectively, which is in accordance with the previous reports …”

Section: Resultsmentioning

confidence: 99%

Aerosol Synthesis and Gas-Phase Photoelectron Spectroscopy of Ag-Bi-I Nanosystems

et al. 2020

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We report on the aerosol generation of ligand-free silver iodobismuthate (Ag-Bi-I) nanoparticles (NPs) and on in situ investigation of their electronic structure using synchrotron radiation soft X-ray aerosol photoelectron spectroscopy (XAPS). The structural and morphological characterizations revealed the aerosol to be composed of spherical rudorffite Ag3BiI6 particles, approximately 100 nm in size. The XAPS showed well-resolved signals from all expected elements (Ag, Bi, and I) and allowed estimation of the NP work function to be about 4.5 eV. The ionization energy of Ag3BiI6 NPs was determined to be 6.1 eV that is in good agreement with our calculations based on a hybrid functional approach. The presented method of production of Ag3BiI6 aerosol can prove beneficial for the future development of Ag-Bi-I-based photovoltaic materials, since it allows the deposition of Ag-Bi-I particles on large surface areas of arbitrary shape and roughness.

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“…6 a. The film made by Ag 3 BiI 6 signifies the trigonal structure with R m space group [ 31 ]. The space group determination of relatively new materials Ag 3 BiI 3 (SCN) 3 and Cu 3 BiI 6 could not be realized.…”

Section: Resultsmentioning

confidence: 99%

Lead-free perovskite solar cells using Sb and Bi-based A3B2X9 and A3BX6 crystals with normal and inverse cell structures

et al. 2017

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Research of CH3NH3PbI3 perovskite solar cells had significant attention as the candidate of new future energy. Due to the toxicity, however, lead (Pb) free photon harvesting layer should be discovered to replace the present CH3NH3PbI3 perovskite. In place of lead, we have tried antimony (Sb) and bismuth (Bi) with organic and metal monovalent cations (CH3NH3 +, Ag+ and Cu+). Therefore, in this work, lead-free photo-absorber layers of (CH3NH3)3Bi2I9, (CH3NH3)3Sb2I9, (CH3NH3)3SbBiI9, Ag3BiI6, Ag3BiI3(SCN)3 and Cu3BiI6 were processed by solution deposition way to be solar cells. About the structure of solar cells, we have compared the normal (n-i-p: TiO2-perovskite-spiro OMeTAD) and inverted (p-i-n: NiO-perovskite-PCBM) structures. The normal (n-i-p)-structured solar cells performed better conversion efficiencies, basically. But, these environmental friendly photon absorber layers showed the uneven surface morphology with a particular grow pattern depend on the substrate (TiO2 or NiO). We have considered that the unevenness of surface morphology can deteriorate the photovoltaic performance and can hinder future prospect of these lead-free photon harvesting layers. However, we found new interesting finding about the progress of devices by the interface of NiO/Sb3+ and TiO2/Cu3BiI6, which should be addressed in the future study.

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Solvothermal Synthesis and Crystal Structure Determination of AgBiI₄ and Ag₃BiI₆.

Cited by 8 publications

References 1 publication

A Versatile Thin-Film Deposition Method for Multidimensional Semiconducting Bismuth Halides

A Versatile Thin-Film Deposition Method for Multidimensional Semiconducting Bismuth Halides

Aerosol Synthesis and Gas-Phase Photoelectron Spectroscopy of Ag-Bi-I Nanosystems

Lead-free perovskite solar cells using Sb and Bi-based A3B2X9 and A3BX6 crystals with normal and inverse cell structures

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