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Novel 3D photoactive direct bandgap perovskites CsBiPbX6 : Ab initio structure and electronic properties. / Kevorkyants, R.; Bahnemann, D. W.; Emeline, A. V.
In: Computational Materials Science, Vol. 183, 109819, 10.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Novel 3D photoactive direct bandgap perovskites CsBiPbX6
T2 - Ab initio structure and electronic properties
AU - Kevorkyants, R.
AU - Bahnemann, D. W.
AU - Emeline, A. V.
PY - 2020/10
Y1 - 2020/10
N2 - We present DFT study on hypothetical 3D all-inorganic metal halide perovskites CsBiPbX6 (X = Cl, Br, I). According to the calculations, the perovskites form cubic, orthorhombic, monoclinic, and trigonal phases which are all direct bandgap semiconductors. Typical of metal halide perovskites, valence bands of the considered species are composed of halide anions’ occupied p-orbitals. Their conduction bands contain about equal contributions from vacant p-orbitals of both Bi3+ and Pb2+ cations. Electronic bandgaps of the studied perovskites range from 1.05 eV to 2.10 eV, whereas estimated optical bandgaps of their cubic F43m phase equal 1.50 eV (CsBiPbI6), 1.87 eV (CsBiPbBr6), and 2.40 eV (CsBiPbCl6). The perovskites’ electronic properties can be fine-tuned by mixing of halide anions. Mixed-halides CsBiPbBrnI(6-n), (n = 1–5) are considered here as an example. Majority of these compounds are direct bandgap semiconductor as well with electronic bandgaps falling in the range [1.08–1.72] eV. Their optical bandgaps are expected to exceed the corresponding electronic ones by a few tenths of an electronvolt. Owing to relatively low lead content, direct electronic transitions, and remarkable tunability of electronic properties the proposed materials may find applications in photovoltaics.
AB - We present DFT study on hypothetical 3D all-inorganic metal halide perovskites CsBiPbX6 (X = Cl, Br, I). According to the calculations, the perovskites form cubic, orthorhombic, monoclinic, and trigonal phases which are all direct bandgap semiconductors. Typical of metal halide perovskites, valence bands of the considered species are composed of halide anions’ occupied p-orbitals. Their conduction bands contain about equal contributions from vacant p-orbitals of both Bi3+ and Pb2+ cations. Electronic bandgaps of the studied perovskites range from 1.05 eV to 2.10 eV, whereas estimated optical bandgaps of their cubic F43m phase equal 1.50 eV (CsBiPbI6), 1.87 eV (CsBiPbBr6), and 2.40 eV (CsBiPbCl6). The perovskites’ electronic properties can be fine-tuned by mixing of halide anions. Mixed-halides CsBiPbBrnI(6-n), (n = 1–5) are considered here as an example. Majority of these compounds are direct bandgap semiconductor as well with electronic bandgaps falling in the range [1.08–1.72] eV. Their optical bandgaps are expected to exceed the corresponding electronic ones by a few tenths of an electronvolt. Owing to relatively low lead content, direct electronic transitions, and remarkable tunability of electronic properties the proposed materials may find applications in photovoltaics.
KW - Crystal structure
KW - DFT
KW - Electronic properties
KW - Metal halide perovskites
KW - Photovoltaics
KW - CSPBCL3
KW - ORGANIC CATIONS
KW - PHASE-TRANSITIONS
KW - CSPBBR3
KW - LEAD
UR - http://www.scopus.com/inward/record.url?scp=85085487122&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/f2b88dd8-a7b1-3b0a-92a2-d8471da9a262/
U2 - 10.1016/j.commatsci.2020.109819
DO - 10.1016/j.commatsci.2020.109819
M3 - Article
AN - SCOPUS:85085487122
VL - 183
JO - Computational Materials Science
JF - Computational Materials Science
SN - 0927-0256
M1 - 109819
ER -
ID: 53785179