CuAlSe Inclusions Trigger Dynamic Cu Ion Depletion from the CuSe Matrix Enabling High Thermoelectric Performance.

Atomic-scale incorporation of CuAlSe inclusions within the CuSe matrix, achieved through a solid-state transformation of CuSe template precursor using elemental Cu and Al, enables a unique temperature-dependent dynamic doping of the CuSe matrix. The CuAlSe inclusions, due to their ability to accommodate a large fraction of excess metal atoms within their crystal lattice, serve as a "reservoir" for Cu ions diffusing away from the CuSe matrix. Such unidirectional diffusion of Cu ions from the CuSe matrix to the CuAlSe inclusion leads to the formation, near the CuAlSe/CuSe interface, of a high density of Cu-deficient β-CuSe nanoparticles within the α-CuSe matrix and the formation of Cu-rich CuAlSe nanoparticles with the CuAlSe inclusions.

Nanoscale Engineering of Polymorphism in CuSe-Based Composites.

Crystal polymorphism selection during synthesis is extremely challenging. However, promoting the formation of a specific metastable polymorph enables modulation of the functional properties of phase-change materials through alteration of the relative abundance of various polymorphs. Here, we demonstrate the stabilization of the superionic β-CuSe phase under ambient conditions and the direct control over the relative ratio between the α-CuSe and β-CuSe polymorphs in ()CuGaSe/(1-)CuSe composites using CuGaSe nanoseeds.

Sustainable p-type copper selenide solar material with ultra-large absorption coefficient.

Earth-abundant solar absorber materials with large optical absorption coefficients in the visible enable the fabrication of low-cost high-efficiency single and multi-junction thin-film solar cells. Here, we report a new p-type semiconductor, CuTiSe (CTSe), featuring indirect (1.15 eV) and direct (1.

Insights on the Synthesis, Crystal and Electronic Structures, and Optical and Thermoelectric Properties of SrSb HfSe Orthorhombic Perovskite.

Single-phase polycrystalline powders of SrSb HfSe ( x = 0, 0.005, 0.01), a new member of the chalcogenide perovskites, were synthesized using a combination of high temperature solid-state reaction and mechanical alloying approaches.

Crystal Structure and Thermoelectric Properties of the L Lillianite Homologue PbBiSe.

PbBiSe, the selenium analogue of heyrovsyite, crystallizes in the orthorhombic space group Cmcm (#63) with a = 4.257(1) Å, b = 14.105(3) Å, and c = 32.

High-Tc Ferromagnetism and Electron Transport in p-Type Fe(1-x)Sn(x)Sb2Se4 Semiconductors.

Single-phase polycrystalline powders of Fe(1-x)Sn(x)Sb2Se4 (x = 0 and 0.13) were synthesized by a solid-state reaction of the elements at 773 K. X-ray diffraction on Fe0.

Pb7Bi4Se13: a lillianite homologue with promising thermoelectric properties.

Pb(7)Bi(4)Se(13) crystallizes in the monoclinic space group C2/m (No. 12) with a = 13.991(3) Å, b = 4.