Interface properties of CsPbBr$_3$ /CsPbI$_3$ perovskite heterostructure for solar cell

Jagadish Kumar; K. P. S. S. Hembram

doi:10.1016/j.physb.2021.413472

Interface properties of CsPbBr$_3$ /CsPbI$_3$ perovskite heterostructure for solar cell

Materials Science 2022-02-15 v1

Authors: Jagadish Kumar , K. P. S. S. Hembram

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Abstract

We explore the interface properties of perovskite heterostructure CsPbBr $_3$ /CsPbI $_3$ through first-principles calculations. The structural interface is formed by the bonding of Cs-Br and Cs-I with bond length of $\sim$ 4.106 and 3.922 \AA. The upshift of Goldsmith tolerance factor in the range $0.8<t<1$ from $t<0.8$ is revealed for the bi-layer interface, from bulk, reflecting the structural rearrangement from anisotropy to isotropy in confinement. The band gap arises mainly due to the energy difference of I-5p orbital than that of Br-4p at the valence band and Pb-6p at the conduction band. Heavier halide shows the red shift in the absorption spectra, for the pristine monolayer component. For the bilayer geometry, iodine contribution is more observed than that of bromine and the underlying interface properties may be useful for solar cell devices application.

Keywords

perovskite heterostructure interface properties first-principles calculation CsPbBr3 CsPbI3 band gap solar cell

Cite

@article{arxiv.2202.06171,
  title  = {Interface properties of CsPbBr$_3$ /CsPbI$_3$ perovskite heterostructure for solar cell},
  author = {Jagadish Kumar and K. P. S. S. Hembram},
  journal= {arXiv preprint arXiv:2202.06171},
  year   = {2022}
}

Comments

12 pages, 6 figures

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