Book ChapterDOI
Electronic Structure of PbS, PbSe, and PbTe
TLDR
In this article, a two-valence band model was proposed for lead-salt ionic semiconductors, based on the properties of PbS, PbSe, and PbTe.Abstract:
Publisher Summary Lead salts are ionic semiconductors with many properties in common. Their IV-VI electron configuration is relatively unusual, and appears to be reflected in the interesting phonon and dielectric properties they share. Among these are low values of the TO phonon frequency at Γ and high static dielectric constants. It is clear that the electronic structures of PbS, PbSe, and PbTe are much the same, with all three lead salts exhibiting a direct minimum energy gap E 0 at the L point. The surfaces of constant energy for both electrons and holes are ellipsoidal near the band edges, but approach a cylinder-like shape farther from the L point. The conduction and valence bands in all the lead salts are definitely nonparabolic, displaying a concomitant dependence of the effective mass on carrier concentration. Based primarily on studies of PbTe, a two-valence band model is well supported by experiment. The order of higher energy bands appears quite well established, and reliable values of the energies of several interband transitions have been obtained.read more
Citations
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Journal ArticleDOI
Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum Dots
Randy J. Ellingson,Matthew C. Beard,Justin C. Johnson,Pingrong Yu,Olga I. Micic,Arthur J. Nozik,Andrew Shabaev,Alexander L. Efros +7 more
TL;DR: It is found that the biexciton effect, which shifts the transition energy for absorption of a second photon, influences the early time transient absorption data and may contribute to a modulation observed when probing near the lowest interband transition.
Journal ArticleDOI
Energy level modification in lead sulfide quantum dot thin films through ligand exchange.
Patrick O. Brown,Donghun Kim,Richard R. Lunt,Ni Zhao,Moungi G. Bawendi,Jeffrey C. Grossman,Vladimir Bulovic +6 more
TL;DR: In this article, it was shown that the energy levels of lead sulfide QDs, measured by ultraviolet photoelectron spectroscopy, shift by up to 0.9 eV between different chemical ligand treatments.
New Materials and Performance Limits for Thermoelectric Cooling
TL;DR: In this paper, the ZT for PGEC relaxation of A,,.34.4.4 Introduction Systematic Search Historical Review New Materials Phonon "Glasses" Desired Performance PGEC Relaxation of A,.
Journal ArticleDOI
Bond ionicity and structural stability of some average-valence-five materials studied by x-ray photoemission
TL;DR: In this paper, core-level and valence-band spectra have been obtained by means of x-ray photoemission spectroscopy for the group IV, V, and VI elements Ge, Sn, Pb, As, Sb, Bi, S, Se, and PbTe and the results, taken under ultrahigh-vacuum conditions with unmonochromatized x rays, are presented and discussed in terms of the bonding in materials with an average valence of 5.
Journal ArticleDOI
Lattice anchoring stabilizes solution-processed semiconductors
Mengxia Liu,Yuelang Chen,Chih Shan Tan,Rafael Quintero-Bermudez,Andrew H. Proppe,Rahim Munir,Rahim Munir,Hairen Tan,Hairen Tan,Oleksandr Voznyy,Benjamin Scheffel,Grant Walters,Andrew Pak Tao Kam,Bin Sun,Min-Jae Choi,Sjoerd Hoogland,Aram Amassian,Aram Amassian,Shana O. Kelley,F. Pelayo García de Arquer,Edward H. Sargent +20 more
TL;DR: ‘lattice-anchored’ hybrid materials that combine caesium lead halide perovskites with lead chalcogenide CQDs are reported, in which lattice matching between the two materials contributes to a stability exceeding that of the constituents.
References
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Journal ArticleDOI
Band structure of indium antimonide
TL;DR: The band structure of InSb is calculated using the k ·. p perturbation approach and assuming that the conduction and valence band extrema are at k = 0 as mentioned in this paper.
Journal ArticleDOI
Ionicity of the Chemical Bond in Crystals
TL;DR: The role of quantum-mechanical sum rules and spectral moments in constructing simplified models of bond and band behavior is explored in this article, where a wide range of physical properties including crystal structure, energy bands, elastic constants, ionization energies, and impurity states are discussed.
Journal ArticleDOI
Theory of Brillouin Zones and Symmetry Properties of Wave Functions in Crystals
TL;DR: In this article, the problem of finding the Brillouin zones is studied from the point of view of group theory, where a representation of the symmetry group is associated with the underlying problem.
Journal ArticleDOI
Electrical and Optical Properties of Epitaxial Films of PbS, PbSe, PbTe, and SnTe
TL;DR: In this article, single-crystal films of PbS, pbTe, PbSe, and SnTe have been grown on heated alkali-halide substrates.