Volume 136, Issue 41 e202408443
Forschungsartikel

3D Lead-Organoselenide-Halide Perovskites and their Mixed-Chalcogenide and Mixed-Halide Alloys

Jiayi Li

Jiayi Li

Department of Chemistry, Stanford University, Stanford, California, 94305 United States

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Dr. Yang Wang

Dr. Yang Wang

Department of Chemical and Biomolecular Engineering, College of Chemistry, UC Berkeley, Berkeley, California, 94720 United States

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Dr. Santanu Saha

Dr. Santanu Saha

Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU United Kingdom

Institut de Recherche sur les Ceramiques (IRCER), UMR CNRS 7315, Université de Limoges, 12 Rue Atlantis, Limoges, 87068 France

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Dr. Zhihengyu Chen

Dr. Zhihengyu Chen

Department of Chemistry, Stony Brook University, Stony Brook, New York, 11794 United States

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Jan Hofmann

Jan Hofmann

Department of Chemistry, Stony Brook University, Stony Brook, New York, 11794 United States

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Jason Misleh

Jason Misleh

Department of Chemistry, Stanford University, Stanford, California, 94305 United States

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Prof. Karena W. Chapman

Prof. Karena W. Chapman

Department of Chemistry, Stony Brook University, Stony Brook, New York, 11794 United States

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Prof. Jeffrey A. Reimer

Prof. Jeffrey A. Reimer

Department of Chemical and Biomolecular Engineering, College of Chemistry, UC Berkeley, Berkeley, California, 94720 United States

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720 United States

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Prof. Marina R. Filip

Corresponding Author

Prof. Marina R. Filip

Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU United Kingdom

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Prof. Hemamala I. Karunadasa

Corresponding Author

Prof. Hemamala I. Karunadasa

Department of Chemistry, Stanford University, Stanford, California, 94305 United States

Stanford Institute for Materials and Energy Sciences (SIMES), SLAC National Accelerator Laboratory, Menlo Park, California, 94025 United States

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First published: 08 July 2024

Abstract

We incorporate Se into the 3D halide perovskite framework using the zwitterionic ligand: SeCYS (+NH3(CH2)2Se), which occupies both the X and A+ sites in the prototypical ABX3 perovskite. The new organoselenide-halide perovskites: (SeCYS)PbX2 (X=Cl, Br) expand upon the recently discovered organosulfide-halide perovskites. Single-crystal X-ray diffraction and pair distribution function analysis reveal the average structures of the organoselenide-halide perovskites, whereas the local lead coordination environments and their distributions were probed through solid-state 77Se and 207Pb NMR, complemented by theoretical simulations. Density functional theory calculations illustrate that the band structures of (SeCYS)PbX2 largely resemble those of their S analogs, with similar band dispersion patterns, yet with a considerable band gap decrease. Optical absorbance measurements indeed show band gaps of 2.07 and 1.86 eV for (SeCYS)PbX2 with X=Cl and Br, respectively. We further demonstrate routes to alloying the halides (Cl, Br) and chalcogenides (S, Se) continuously tuning the band gap from 1.86 to 2.31 eV–straddling the ideal range for tandem solar cells or visible-light photocatalysis. The comprehensive description of the average and local structures, and how they can fine-tune the band gap and potential trap states, respectively, establishes the foundation for understanding this new perovskite family, which combines solid-state and organo-main-group chemistry.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.