Bandgap lowering in mixed alloys of Cs2Ag(SbxBi1−x)Br6 double perovskite thin films

@article{Li2020BandgapLI,
  title={Bandgap lowering in mixed alloys of Cs2Ag(SbxBi1−x)Br6 double perovskite thin films},
  author={Zewei Li and Se{\'a}n R. Kavanagh and Mari Napari and Robert G. Palgrave and Mojtaba Abdi‐Jalebi and Zahra Andaji‐Garmaroudi and Daniel W. Davies and Mikko Laitinen and Jaakko Julin and Richard H. Friend and David O. Scanlon and Aron Walsh and Robert L. Z. Hoye},
  journal={Journal of Materials Chemistry A},
  year={2020}
}
Reductions in the bandgap of Cs2AgBiBr6 and Cs2AgSbBr6 thin films are achieved through alloying due to non-linear mixing of Bi and Sb orbitals. 

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References

SHOWING 1-10 OF 74 REFERENCES

Bandgap Engineering of Lead-Free Double Perovskite Cs2 AgBiBr6 through Trivalent Metal Alloying.

TLDR
Band structure calculations indicate that opposite band gap shift directions associated with Sb/In substitution arise from different atomic configurations for these atoms, which provides an important approach for targeting outstanding PV performance within this double perovskite family.

Defect-Induced Band-Edge Reconstruction of a Bismuth-Halide Double Perovskite for Visible-Light Absorption.

TLDR
The alloyed perovskite described herein is the first double perovSKite to show comparable bandgap energy and carrier lifetime to those of (CH3NH3)PbI3 and is very promising for photovoltaic applications.

Band-Like Charge Transport in Cs2AgBiBr6 and Mixed Antimony–Bismuth Cs2AgBi1–xSbxBr6 Halide Double Perovskites

TLDR
It is shown that wet chemical processing of Cs2AgBi1–xSbxBr6 powders is a successful route to prepare thin films of these materials, which paves the way toward photovoltaic devices based on nontoxic HDPs with tunable band gaps.

High-Quality Cs2 AgBiBr6 Double Perovskite Film for Lead-Free Inverted Planar Heterojunction Solar Cells with 2.2 % Efficiency.

TLDR
A high-quality Cs2 AgBiBr6 film with ultra-smooth morphology, micro-sized grains, and high crystallinity is realized via anti-solvent dropping technology and post-annealing at high temperature and shows no hysteresis and a high stability.

Composition Stoichiometry of Cs2AgBiBr6 Films for Highly Efficient Lead-Free Perovskite Solar Cells.

TLDR
The finding in this work provides a clear clue that a precise composition stoichiometry could guarantee the formation of high quality multicomponent perovskite films.

A Bismuth-Halide Double Perovskite with Long Carrier Recombination Lifetime for Photovoltaic Applications.

TLDR
The double-perovskites are used to incorporate nontoxic Bi(3+) into the perovskite lattice in Cs2AgBiBr6 (1), which shows a long room-temperature fundamental photoluminescence (PL) lifetime and comparison between single-crystal and powder PL decay curves of 1 suggests inherently high defect tolerance.

Cs2AgBiX6 (X = Br, Cl): New Visible Light Absorbing, Lead-Free Halide Perovskite Semiconductors

The double perovskites Cs2AgBiBr6 and Cs2AgBiCl6 have been synthesized from both solid state and solution routes. X-ray diffraction measurements show that both compounds adopt the cubic double

Band Gaps of the Lead-Free Halide Double Perovskites Cs2BiAgCl6 and Cs2BiAgBr6 from Theory and Experiment.

TLDR
From the complementary theoretical and experimental analysis, this work is able to assign the indirect character of the band gaps and obtain both experimental and theoretical band gaps of these novel semiconductors that are in close agreement.

Can Pb-Free Halide Double Perovskites Support High-Efficiency Solar Cells?

TLDR
It is demonstrated that the combination of Ag(I) and Bi(III) leads to the wide indirect band gaps with large carrier effective masses owing to a mismatch in angular momentum of the frontier atomic orbitals, which can be overcome by replacing Ag with In or Tl; however, the resulting compounds are predicted to be unstable thermodynamically.
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